Start a Vicious Cycle
Whether you’re on a stationary bike or a real one, this stamina-building interval from Flywheel’s Holly Rilinger will have you walking like Yosemite Sam when you’re through.
Step 1: Sprint at low resistance (30 sec)
Step 2: Recover (60 sec)
Step 3: Sprint at high resistance (30 sec)
Step 4: Recover at low resistance (60 sec)
Step 5: Repeat steps 1–4 nine times
Total time: 30 minutes