The general rule for stretching is to hold each stretch for a total of 60 seconds per muscle group, at least two days per week, and only stretch to the point of mild discomfort, never pain. That simple framework, backed by the American College of Sports Medicine, covers the essentials for maintaining flexibility in healthy adults. But the details of how you stretch, when you stretch, and how intensely you stretch all matter for getting the most benefit without wasting your time.
The 60-Second Rule
The core guideline is straightforward: accumulate 60 seconds of total stretching time for each major muscle group. You can break that up however you like. Three holds of 20 seconds, two holds of 30 seconds, or four holds of 15 seconds all reach the same target. The ACSM recommends hitting this minimum on at least two days per week, covering all major muscle-tendon groups: hamstrings, quadriceps, hip flexors, calves, chest, shoulders, and upper back.
More frequent stretching will produce better results. People who stretch daily or five times per week tend to see greater improvements in range of motion than those who do the bare minimum. But two days a week is the floor for maintaining what you already have.
Stretch to Discomfort, Not Pain
The single most important intensity rule is to take each stretch to the point where you feel a pulling or stretching sensation, then stop before it becomes painful. Research on stretching intensity draws a clear line between these two thresholds: the “point of stretch” and the “first onset of pain.” Participants in pain-sensitivity studies are specifically instructed to stop the movement the moment the sensation shifts from stretch to pain.
This matters because pushing into pain doesn’t make you more flexible faster. It triggers a protective tightening reflex in the muscle, which works against what you’re trying to accomplish. A moderate, steady pull that you can breathe through is the sweet spot.
Dynamic Before, Static After
The timing rule is simple: use dynamic stretching before a workout and save static stretching for afterward. Dynamic stretching involves controlled movements through your full range of motion, like leg swings, arm circles, or walking lunges. Static stretching means holding a position without moving.
The reasoning is practical. Dynamic stretching has been shown to improve muscular and sprint performance, while static stretching before exercise can reduce the contractile force your muscles produce. The effect isn’t enormous, and some newer studies suggest static stretching may not always hurt performance, but the overall trend favors dynamic movement as a warm-up strategy. If you’re about to run, play a sport, or lift weights, moving stretches prepare your muscles better than holding still.
Static stretching works best after exercise or as a standalone flexibility session. Your muscles are already warm, your body is primed to relax into deeper ranges of motion, and there’s no upcoming performance to worry about.
Warm Up Before You Stretch
Stretching cold muscles is less effective and more uncomfortable than stretching warm ones. A light aerobic warm-up of 5 to 10 minutes, something as simple as brisk walking, light jogging, or cycling, increases blood flow to your muscles and raises tissue temperature. Research has found that even 5 minutes of running before static stretching improves range of motion compared to stretching alone.
If you’re doing a standalone stretching session outside of a workout, start with a few minutes of easy movement first. Walking up and down stairs, marching in place, or doing jumping jacks all work. The goal is to feel slightly warm before you settle into your holds.
Avoid Bouncing
Ballistic stretching, which involves bouncing at the end of your range of motion, is generally not recommended for most people. It relies on high-velocity, uncontrolled movements that push past your comfortable range before your muscles can adapt. The risk of straining a muscle or tendon is higher than with controlled stretching methods, especially if you’re a beginner or haven’t warmed up thoroughly.
Dynamic stretching might look similar at first glance, but the key difference is control. A leg swing is smooth and deliberate. A ballistic bounce is fast and forceful, jerking into the end range rather than easing into it.
Older Adults May Need More Time
If you’re over 60, the standard 60-second rule still applies as a starting point, but older muscles and tendons often need longer stretching durations to see meaningful changes in stiffness. Studies on older adults have used 30-second holds repeated three or more times per muscle group (totaling 2 minutes or more) to produce improvements in range of motion. Some research suggests that reducing muscle stiffness in older adults may require significantly longer stretching sessions, with durations of 5 minutes per muscle group showing measurable decreases in tissue stiffness.
The practical takeaway: if you’re older and feel like the standard recommendations aren’t doing much, try holding each stretch longer or adding more repetitions. Be patient with the process, since connective tissue becomes less pliable with age and responds more slowly to stretching.
What Stretching Won’t Do
Stretching has a reputation for preventing injuries and reducing post-exercise soreness, but the evidence tells a different story. A Cochrane review of randomized studies found that stretching before exercise reduced next-day soreness by about half a point on a 100-point scale. Stretching after exercise reduced it by about one point. Even stretching both before and after exercise only cut peak soreness by roughly four points over a week. These reductions are too small to notice in real life.
An international consensus of stretching researchers concluded that stretching does not reduce overall injury risk, does not meaningfully contribute to muscle growth, does not improve posture, and does not enhance post-exercise recovery. In some specific cases it may reduce the risk of muscle strains, but this could come with a slight trade-off of increased bone and joint injuries.
None of this means stretching is useless. Its real, well-supported benefit is improving and maintaining range of motion. If you can touch your toes, rotate your shoulders fully, and move through daily activities without stiffness, that flexibility has genuine value for quality of life. Just don’t expect stretching to be a cure-all for soreness or a substitute for a proper warm-up.
A Simple Stretching Routine
Putting the rules together, a basic flexibility practice looks like this:
- Frequency: At least 2 days per week, ideally more
- Duration: 60 seconds total per muscle group (e.g., 2 holds of 30 seconds)
- Intensity: Stretch to a comfortable pulling sensation, not pain
- Timing: Dynamic stretches before exercise, static stretches after or on their own
- Preparation: 5 to 10 minutes of light aerobic activity before static stretching
- Technique: Smooth, controlled movements with no bouncing
Cover the major muscle groups in both your upper and lower body, breathe steadily through each hold, and increase your range of motion gradually over weeks rather than forcing it in a single session. Flexibility improves slowly, but it improves reliably when you show up consistently.