High Knees HIIT training for tennis. This workout really gives a lot to your legs and your thighs. Other areas getting worked out also include your core and your gluteal (glute) muscles.
Disclaimer: Do not perform these exercises if you have any injury, get rehabilitation first. If you get short of breath, feel fatigued or tired during any of these workouts, stop and take a break. Consult a doctor/trainer if necessary before starting any workout session. Children should do them under supervision of an adult.
These workouts are taken from the Darebee 30 days of HIIT program.