Thirty-Thirty Bike Sprints

12 × 30s hard / 30s easy after a 10 min warm-up. Stop the set when power drops twice.

Difficulty 4 of 510.5 METs · Vigorous

Equipment

Stationary bike

Muscle groups worked

Glutes
Hip flexors
Calves

What it buys you

Raises the ceiling, not the floor. Trains the body to clear the effort of a hard surge fast enough to do it again.

Capacity trained

Endurance. Aerobic capacity and vascular function. The single best-evidenced physical input to sexual performance.

Train it · Deep Base Test your limiter

Energy

Modelled kilocalories

Modelled energy cost for Thirty-Thirty Bike Sprints at 10, 20, 30 and 45 minutes for both reference bodies
Reference body	10 min	20 min	30 min	45 min
Male reference · 82 kg	151 kcal	301 kcal	452 kcal	678 kcal
Female reference · 68 kg	125 kcal	250 kcal	375 kcal	562 kcal

Energy figures are modelled from standard activity MET values (Ainsworth Compendium, 2011) and the ACSM equation, not measured on you. They scale linearly with your own body mass, so a body 10% heavier burns about 10% more at the same intensity.

kcal = METs × 3.5 × bodyweight(kg) ÷ 200 × minutes (ACSM)

Load is effort, not pain. If a movement hurts rather than works, stop and see a clinician. Lifting another person is strength training with a person-shaped load — build the pattern unloaded first.

Cross-reference

Positions this workout helps · 45

It serves Seated Astride, Standing, Elevated / Bridged and Lifted / Carried. Every position in those families is listed below, hardest first.

Honest framing

Training makes a posture available and sustainable. It is capability work, not a treatment for anything, and no single session changes a number. Consistency over eight weeks does.