Warm up for 10 minutes then perform 10 minutes of 10 secs full gas, 20 seconds recovery (barely any pressure on the pedals). Spin your legs for 5 minutes then perform 10 minutes of 20 seconds on / 40 off , recover for 5 minutes then a final 10 minute set of 10 secs on / 20 off , warm down for 10 minutes.