VO2max Intervals

VO2max intervals are short, near-max cardio repeats that train your aerobic power and your leg endurance. The goal is to accumulate time above around 90 percent of your max heart rate while staying in control.

Choose a machine - rower, bike, or SkiErg - or run. Warm up fully. Set the machine for the chosen interval length and note your heart-rate monitor if you use one. Stand or sit with a strong posture: chest up, shoulders relaxed, and feet secure.

Start each rep hard and build into a fast but repeatable pace. Keep your cadence or stroke rate steady and your form clean from start to finish. When the work interval ends, drop into easy movement right away - keep the legs turning on the bike, paddle lightly on the rower, or jog/shuffle if running. Rest just long enough that you can hit the same output on the next rep, then go again.

Breathe deep and rhythmically, and brace your core lightly so you do not slouch as you fatigue. To make it easier, shorten the work interval or add more recovery. To make it harder, lengthen the work interval slightly or trim the rest, as long as the last rep still matches the first.

Fault: Going all-out on rep one and fading hard. Fix: Treat the first rep like a pace setter; each repeat should feel hard but repeatable so the final rep matches the first.

Fault: Stopping completely during recovery. Fix: Keep moving during the rest - easy pedaling, light rowing, or a shuffle - so your heart rate comes down without your muscles locking up.

Fault: Skipping the warm-up or doing too many sessions. Fix: Build an aerobic base first, complete a full warm-up, and cap this work at one to two sessions per week.