Are your muscles ageing faster than you? Take this simple test to know your muscle age. Step 1 : Choose a suitable chair The height of the chair should be approx. 43 cm (1.4 ft). Step 2 :Use a stopwatch to time yourself. Sit-to-stand on both legs 5 times with arms folded as fast as you can. Step 3: Calculate your #muscleage with these simple steps. #EnsureStrongerInsideOut