Stand up straight with a wobble cushion on the floor.
Step the leg you would like to exercise onto the centre of the wobble cushion.
Gain your balance with your knee softened.
Maintaining your balance, raise your other knee up in front of you.
Bring your opposite arm forward and the other back at the same time.
Bend your stance leg as you lower your elevated leg back down and behind you, bending your body forward at your hips.
Allow your arms to swap over.
Control your balance as you bring your elevated leg back forward and up and repeat the motion.
There is no need to rush this exercise, the focus is on keeping your balance.