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Fitness

Zone 5 Intervals

Zone 5 intervals are short maximal cardio bursts at roughly 90–100% max heart rate with full recovery between reps. One to two weekly sessions suffice for most athletes.

Zone 5 intervals are maximal or near-maximal efforts—roughly 90–100% max heart rate for short bursts with long rests—used sparingly to raise VO₂ max and anaerobic capacity. One to two sessions weekly is enough for most non-elites; more risks injury and poor recovery.

Warm up thoroughly and stop if form breaks.

Common questions

  • How long should a zone 5 interval last?

    Often 20–60 seconds for repeats with full recovery; longer all-out efforts increase hamstring and Achilles risk without extra benefit for most.

  • Can beginners do zone 5?

    Build four to eight weeks of base cardio first; start with bike or row sprints to reduce impact until tolerance is proven.

Related guide

Zone 2 Cardio for Beginners →

Related terms

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