How long should I hold each stretch?

For static stretching aimed at increasing flexibility, hold each stretch for 30–60 seconds per side. Research shows diminishing returns beyond 60 seconds in a single hold. For PNF stretching, use 6–10 seconds of isometric contraction followed by 20–30 seconds of passive hold. For dynamic warm-up stretching, 5–10 controlled repetitions of each movement (roughly 10–15 seconds) is appropriate before activity.

Should I stretch before or after exercise?

Static stretching performed before exercise can temporarily reduce power output and neuromuscular performance, so it is not recommended as a pre-workout warm-up for strength or power activities. Dynamic stretching and mobility work are appropriate before exercise. Static stretching is most beneficial after exercise when muscles are warm, blood flow is high, and the nervous system is not primed for explosive output.

How many times per week should I stretch for flexibility gains?

Flexibility research consistently shows that daily stretching produces faster gains than less frequent sessions. A minimum of 3–4 sessions per week is required to make meaningful progress. Each major muscle group should be stretched for a cumulative total of 60 seconds per session (one 60-second hold or two 30-second holds) to drive adaptation.

Is stretching better than yoga for flexibility?

Static stretching is more direct and time-efficient for targeting specific muscle tightness — ideal when you have 10–15 minutes post-workout and a defined set of tight areas to address. Yoga combines flexibility, strength, balance, and mindfulness, making it a more comprehensive practice but also more time-intensive. Both produce flexibility gains; the best choice depends on your available time, training goals, and personal preference.

Stretching Timer

Free stretching timer with hold intervals and rest cues for flexibility training, yoga flows, and cool-down routines. Set custom hold durations and number of stretches.

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Rest

Rounds

Stretching timers are a distinct use case from high-intensity interval timers: rather than maximizing effort, the goal is to hold each position long enough for the muscle and connective tissue to respond to the stretch stimulus. Research on static stretching indicates that holding a stretch for at least 30 seconds is required to produce measurable increases in flexibility, with 60–90 second holds producing the greatest acute range-of-motion improvements. Proprioceptive Neuromuscular Facilitation (PNF) stretching, which alternates between passive holds and brief isometric contractions, uses shorter cycles — typically 10 seconds of contraction followed by 20–30 seconds of passive hold — making a dedicated interval timer ideal. Dynamic stretching, used as a warm-up, uses even shorter intervals of 5–10 seconds per movement before transitioning. A well-structured post-workout stretching routine of 10–15 minutes can meaningfully improve flexibility, reduce delayed onset muscle soreness (DOMS), and lower injury risk over time. Using a timer rather than counting ensures each stretch receives the correct duration regardless of the athlete's fatigue level or tendency to rush. The structured format also helps practitioners build comprehensive routines that address all major muscle groups systematically.

Free Online Interval Timer

Zolkit's interval timer runs entirely in your browser — no app to install, no account required. Set any work and rest duration, choose a round count, and start training immediately. Built-in presets cover the most popular protocols: Tabata, HIIT, AMRAP, EMOM, boxing rounds, circuit training, the 7-minute workout, and stretching. Audio cues signal every phase transition so you can keep your eyes on your form, not the screen.

Precise Interval Timing

Accurate to the second with clear audio cues at every work-rest transition. Keeps you focused on training, not clock-watching.

8 Built-In Workout Presets

One-click presets for Tabata, HIIT, AMRAP, EMOM, boxing rounds, circuit training, the 7-minute workout, and stretching — loaded and ready to start.

Fully Customizable Intervals

Set any work duration, rest duration, and round count. Save up to 5 custom presets with your own names for instant access on future sessions.

Audio Phase Cues

Distinct audio tones signal the start of work, the start of rest, and the final round complete. Mute toggle for silent environments.

Works on Any Device

Fully responsive on smartphones, tablets, and desktops. Use it propped up in the gym or on a laptop at home — no installation required.

Completely Free

No subscription, no ads mid-workout, no paywalled presets. All features are available to every user with no account needed.

How to Use the Interval Timer

1
Choose a preset workout (Tabata, HIIT, boxing rounds, etc.) or set your own work time, rest time, and round count using the custom fields. Your settings are saved between sessions.
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Click Start. The timer counts down the work interval with a color indicator, then automatically switches to the rest period with an audio cue. Round progress is displayed throughout.
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The timer advances through all rounds automatically. When the final round is complete, a finish sound plays and your total workout is done. Use the Reset button to run it again or adjust your settings.