Work your behind
“Firm buttock muscles help prevent back, hip and knee problems,” says Sammy. Try swimming on your front, holding a float and kicking your legs. Or lie on your back with your knees bent and your feet flat on the floor, hip-width apart, underneath your knees. Raise your hips to create a straight line from your knees to your shoulders. As you come up, tighten your tummy and bottom. Lower yourself and repeat ten times.