Bicycle crunch
Lie on your back with knees bent to 90 degrees and hands by your ears. Slowly extend left heel towards the floor while reaching left elbow across to right knee. Repeat on opposite side.
Toe taps
Keeping your body upright, drive your arms in a running motion, while lifting one leg at a time, knee bent. Gently tap each foot on the top of a step. Repeat, alternating as fast as you can.
Mountain climber
Starting in plank position, lift left toe off floor, bring left knee towards chest and gently tap floor with toe. Return to plank and repeat on right. Alternate as fast as you can. Repeat toe taps, as before.
Forward lunge
With hands on hips, step forward on to your left foot (about 1m in front of you). Slowly bend knees to 90 degrees to lower your hips. Push through your heel to return to starting position. Repeat on right side. Repeat toe taps, as before.
Back squat
Stand with feet slightly wider than shoulder-width apart, and straight. Lower hips and bend knees to 90 degrees, keeping chest upright. Pause, then return to standing position. Repeat toe taps, as before.