Note: It's always advisable to consult a doctor before trying any exercise
High knees
1. Stand straight and bend your arms at 90 degrees.
2. Lift your right leg, knee bent, bringing it higher than your hips while stand on the toes of your left foot.
3. Lower it down.
4. Now do the same with your left leg.
5. Continue to alternate right and left legs.
6. Increase or decrease speed as per your comfort level.
Benefits
Teaches the leg muscles especially the hip, butt and core.
Legs develop speed, power, and flexibility.
Helps to improve your running form
Watch it in You Tube: