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True sprint interval training (SIT)

Sprint Intervals: Peak

Ten all-out sprints with extended recovery — the strongest stimulus for VO2 max, mitochondrial density and bone-protective hormones. Bodyweight default, machine swap noted. Fuel first: have a small snack with protein and carbs beforehand — don't train on an empty stomach. Afterwards, aim for about 40 g of protein within 45 minutes.

40 minAdvancedNo equipment
60

Warm-up

  • Marching in Place with Arm Circles

    240 seconds

    Stand tall and proud, feet hip-width apart, arms relaxed at your sides; as you gently lift one knee, just a few inches, like marching in slow motion, let your arms trace graceful circles forward and back, breathing smoothly and deeply—in through your nose as you lift, out through your mouth as you lower. Focus on keeping your core gently engaged, feeling stable and strong as you move. A common mistake is rushing the steps or letting your shoulders hunch; remember, it's about control and fluidity, not speed. You've got this!

    Illustration of Marching in Place with Arm Circles
  • Dynamic Leg Swings Front to Back

    180 seconds

    Stand tall with a gentle core embrace, softly gazing forward. Now, with a little twinkle in your step, let your leg gently swing forward and back like a pendulum, exhaling softly as it reaches its highest point in front, then inhaling as it swings back. Remember to keep your standing leg slightly soft, like a spring. A common thing we sometimes do is let our body lean too much, instead of letting the leg do the work. You've got this beautiful movement.

    Illustration of Dynamic Leg Swings Front to Back

Main session

Sprint Intervals

6 rounds. Full recovery between efforts.
  • All-Out Sprint (bike, hill, stairs or fast run in place)

    30 seconds

    Maximum effort for the full 30 seconds — a true 9 to 10 out of 10. Use a bike, a hill, stairs, or fast running in place. Stay tall, drive your arms and hold your pace to the very end. If you can talk, push harder.

  • Gentle Walk

    180 seconds

    Walk slowly and let your heart rate and breathing settle fully before the next sprint. Quality beats quantity — every effort should be as strong as the first.

    Illustration of Gentle Walk

Cool-down

  • Marching in Place Slow

    180 seconds

    As you begin your marching, stand tall with a soft bend in your knees, gently engaging your core. Now, slowly and mindfully lift one knee, then the other, taking just two to four thoughtful steps, inhaling as you lift a knee and exhaling softly as you lower it. Focus on keeping your shoulders relaxed and down, avoiding any shrugging toward your ears. Remember, the goal is a controlled, deliberate lift and lower, not a race.

    Illustration of Marching in Place Slow
  • Hamstring Stretch Standing or Seated

    120 seconds

    Okay, let's gently stretch those hamstrings. Begin by either sitting tall with your legs extended in front of you, or standing with one heel propped slightly in front of the other, knee relaxed. As you exhale slowly, lean forward from your hips, keeping your back long and straight as if someone is pulling a string from your chest, feeling a gentle pull along the back of your leg. Remember to inhale as you return to the starting position. A common mistake is rounding your back, which can strain it and doesn't effectively stretch the hamstring, so focus on that flat back.

    Illustration of Hamstring Stretch Standing or Seated

Tags

cardiosprintsitintervalsadvanced