Osaka said she does a light warmup before her workout, and one of the moves is a kneeling quad stretch. She does this without holding her back foot.
- Begin in a runner's lunge with your right foot forward. Slowly lower your left knee to the floor.
- Take a few moments to find balance, and once you're stabilized, grab your left foot with your left hand.
- Hold for 30 seconds, then switch sides.
- Osaka does this three times on each side.
Image Source: POPSUGAR Photography / Kyle Hartman