High Knees
Stand with your feet hip-width apart. Lift up your left knee to your chest.
Switch to lift your right knee to your chest. Continue the movement, alternating legs and moving at a sprinting or running pace.
Imaginary Skipping 
Imagine you’ve got a rope with you. 
Swing and hop on your legs - alternate it, left and right 
Jump as high as you can and land gently. 

Jumping jacks
Stand upright with your legs together, arms at your sides.
Bend your knees slightly, and jump into the air.
As you jump, spread your legs to be about shoulder-width apart. Stretch your arms out and over your head.
Jump back to starting position.

Mountain climbers
1. Put both hands and knees on the floor.
2. Place your right foot near your right hand and extend your left leg behind you. 
3. In one smooth motion, switch your legs, keeping your arms in the same position. 
4. Switch your legs back and forth twice, such that your right leg is again close to your right hand.