Cardio · Machine · Learn first
Stationary bike
Seat about hip height, so the knee stays slightly bent at the bottom of the pedal. Hands light on the bars.

- 1Pedal in circles. Push down and pull through the bottom.
- 2Hips stay on the seat. Don't rock from side to side.
- 3Keep a pace you can hold. Ease off if a knee starts to ache.
Easy to miss: A seat so low the knee drives far past the toes, or only mashing the downstroke.