Stretching Guide for Athletes: When to Stretch, How to Stretch, and Why It Matters

Should you stretch before or after a workout? How long should you hold a stretch? Is stretching even necessary? These are questions that come up constantly in the gym, on the trail, and in the clinic — and the answers have changed significantly as the research around stretching has evolved. Get more in depth with how and when to stretch for athletes.

This is Part 1 of the Snow Beast Performance Stretching 101 series. It covers the foundational questions: what stretching actually is, the different types and what each accomplishes, and when to use them for the best results. Parts 2 and 3 go deeper into the factors that affect your flexibility and a training technique that may actually improve flexibility more effectively than stretching alone.

What Stretching Is — and What It Isn't

Before getting into the how and when, it's worth defining the terms clearly — because flexibility and mobility are often used interchangeably, and they're not the same thing.

Stretching is a form of physical exercise in which a specific muscle group is deliberately elongated to improve flexibility and achieve comfortable muscle tone.

Flexibility is the ability of muscles and soft tissues to move through an unrestricted, pain-free range of motion.

Mobility is broader. It includes flexibility, but also encompasses joint mechanics, neuromuscular control, strength through range of motion, and other factors that determine how freely and effectively you move.

A useful way to think about this relationship: if mobility is at the core of an onion, flexibility is one of the outermost layers. Improving flexibility through stretching is often the necessary first step — but it's just one layer. Beneath it you may find restrictions in connective tissue, joint mobility limitations, or strength and control deficits that stretching alone won't address. Peeling the outer layer is still essential. It just isn't the whole job.

With that context in place, stretching remains one of the most accessible, effective, and underutilized tools available to athletes at every level. It's free, it requires no equipment, and it directly supports health, fitness, performance, and rehabilitation goals. The key is understanding which type of stretching to use, and when.

The Four Main Types of Stretching

Static Stretching

Static stretching is what most people picture when they think of stretching — slowly moving into a position that elongates a target muscle and holding it there, near the end of its range of motion. It can be performed actively (using your own muscular effort to hold the position) or passively (using a wall, strap, or another person to provide support).

Static stretching is the most effective method for producing lasting improvements in muscle length when held for appropriate durations — typically 30 seconds or longer per position, with a cumulative target of at least two minutes per muscle group. It's a cornerstone of any flexibility-focused program and an important cool-down tool after training sessions.

Dynamic Stretching

Dynamic stretching involves actively controlled movement through a joint's range of motion — leg swings, hip circles, arm reaches, or sport-specific movement patterns performed continuously without holding a position for more than a second or two.

Unlike static stretching, dynamic stretching doesn't aim to increase flexibility in the moment. Its primary value is warming up the neuromuscular system — activating the muscles and movement patterns relevant to the upcoming activity while increasing blood flow and tissue temperature. This makes it the appropriate choice for pre-workout preparation.

Ballistic Stretching

Ballistic stretching is a subcategory of dynamic stretching that uses momentum — bouncing or swinging — to drive a muscle toward end range. It is generally more aggressive and less controlled than standard dynamic stretching, and carries a higher risk of injury if the muscles and connective tissues aren't conditioned for that kind of end-range stress.

For most athletes, dynamic stretching accomplishes the same warm-up goals with significantly less risk. Ballistic stretching has specific applications in some athletic contexts but is not recommended as a general practice without appropriate preparation and guidance.

Proprioceptive Neuromuscular Facilitation (PNF) Stretching

PNF stretching leverages the nervous system to achieve greater range of motion than passive stretching alone. While there are several PNF variations, the general approach involves contracting a muscle group — either the target muscle or its opposing muscle — followed by a passive or static stretch. The neurological response to the contraction allows the target muscle to relax more completely into a deeper stretch.

PNF is one of the most effective techniques for producing rapid flexibility gains and is commonly used in physical therapy and high-performance athletic training. It requires a partner or therapist to be done safely and effectively. We'll go deeper on PNF in a future post in this series.

When to Stretch: Before or After Exercise?

This is the question that generates the most confusion — and the answer depends on which type of stretching you're talking about and what you're trying to accomplish.

Before Exercise

Dynamic stretching is the right choice before a training session or competition. It prepares the body for the specific demands of the upcoming activity by activating relevant movement patterns, increasing muscle temperature, and priming the neuromuscular system. A pre-workout dynamic routine should include movements that mirror or closely approximate what the session will demand — hip hinges before deadlifts, leg swings before running, rotation patterns before a rotational sport.

Static and PNF stretching are generally not recommended immediately before exercise. Research has shown that long-duration static holds can temporarily reduce muscle elasticity and contractile capacity — meaning they may slightly reduce strength and power output if performed right before a training session. The exception is when significant tightness or inflexibility in a specific area would create a greater performance limitation than the stretching itself. If you can't get into a safe or effective position for a key movement without first addressing a restriction, a brief static stretch of that area is warranted — then follow it with dynamic activation before loading the pattern.

After Exercise

Post-workout is where static and PNF stretching are most effective and most appropriate. Muscles are warm, blood flow is elevated, and the nervous system is primed — all of which allow you to reach greater range of motion with less discomfort and produce more lasting flexibility improvements.

Static stretching after training serves several purposes: it helps restore resting muscle tone after sustained contraction, supports flexibility gains in areas that need them, and can serve as an effective cool-down that helps regulate breathing and prepare the body to transition out of training mode. For athletes dealing with chronic tightness in specific areas, post-workout static stretching is one of the most productive times to address it.

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How Stretching Fits Into a Complete Mobility Routine

Stretching is a powerful tool — but it works best as part of a broader mobility approach rather than in isolation. Soft tissue work with a foam roller or lacrosse ball prepares the tissues for more effective stretching by reducing restriction and improving pliability. Stability and strength work after stretching reinforces new range of motion with neuromuscular control.

For a complete framework of how these layers fit together and what order to work through them, our mobility exercises guide covers the full progression. And for a deeper look at soft tissue preparation specifically, our post on mobilizing with a lacrosse ball is a practical companion read.

Part 2 of this stretching guide for athletes series explores the factors that determine your flexibility — including genetics, anatomy, and activity level — and digs into the full list of benefits stretching offers beyond just range of motion. Read Part 2 here.

Part 3 of this stretching guide for athletes series reviews loading under tension to develop strength through the newly acquired range of motion. Often, we see that restricted tissues and joints not only need to open into more mobility, but that they also need strength over length. Read Part 3 about eccentric loading here.

If you're working through a specific flexibility or mobility limitation and want a structured program built around your needs, our physical therapy services in Williston, VT are a good starting point. Get started with a free 15-minute discovery call and let's build a plan that works for you.

FAQ: More From the Stretching Guide for Athletes

How long should I hold a static stretch? For meaningful flexibility improvements, hold each static stretch for a minimum of 30 seconds and aim for a cumulative two minutes per muscle group per session. Shorter holds — under 15 seconds — produce minimal lasting change. The sensation should be mild elastic tension that you could gently push further, not sharp or intense discomfort. Breathing slowly and consistently through the hold helps the nervous system relax into the stretch more completely.

Will stretching help reduce muscle soreness after a workout? The evidence on stretching as a soreness reducer is mixed — it doesn't reliably prevent or eliminate delayed onset muscle soreness (DOMS). What post-workout stretching does reliably accomplish is restoring resting muscle tone, supporting flexibility gains, and helping the body transition out of a high-output training state. For athletes who find it feels good after a session, that's a completely valid reason to include it — subjective comfort and recovery quality matter.

Is it bad to stretch cold muscles? Stretching without any warm-up increases the risk of tissue strain and makes it harder to reach useful ranges of motion comfortably. A brief warm-up — even five to ten minutes of light movement — before static stretching makes the session more effective and more comfortable. If you're stretching first thing in the morning or after a long period of inactivity, start gently and build into deeper ranges gradually rather than pushing immediately to end range.

How is PNF stretching different from regular static stretching? PNF stretching uses the nervous system — specifically the relaxation response that follows a muscular contraction — to allow deeper range of motion than passive static stretching alone. After contracting the target muscle (or its opposing muscle) for several seconds, the muscle relaxes more completely, allowing a greater stretch. PNF consistently produces faster flexibility gains than static stretching and is widely used in physical therapy and athletic training. It typically requires a partner or therapist to perform safely and effectively.

Do I need to stretch every day? Daily stretching produces the best results for athletes working to improve flexibility — consistency matters more than duration per session. That said, flexibility maintenance requires less frequency than flexibility development. Once you've reached a target range of motion, less frequent stretching is often sufficient to maintain it. Your physical therapist can help you determine what frequency is appropriate for your specific goals and current flexibility levels.

Written by Alex Denny, DPT — Snow Beast Performance, Williston, VT