Sunita Williams addresses bone density loss concerns, shares her workout routine in space

Suni said if they do not work out every day, they will lose bone density. Sunita Williams wakes up at 6.30 am while Butch is an early-riser and wakes up at 4.30am. Their exercise regime includes cardio vascular, running on the treadmill, using a machine to perform deadlifts and squats etc.