On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earthâs mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects. At Earthâs surface the acceleration of gravity is about 9.8 metres (32 feet) per second per second. Thus, for every second an object is in free fall, its speed increases by about 9.8 metres per second. At the surface of the Moon the acceleration of a freely falling body is about 1.6 metres per second per second.
Physicians and physiologists have warmed to the idea of water walking as therapy and good exercise for people with joint pain and damage for its many benefits, which include: 1  Waterâs buoyancy reduces the impact on joints.  Working out in water can help improve cardiovascular fitness, balance and range of motion.
You may burn up to 250 calories by walking for 30 minutes in water up to your chest. To burn that many calories you have to move your arms around in the water. For me, this is the equivalent of using an elliptical machine for 30 minutes, but is more than I generally burn walking for 30 minutes on a treadmill. Jogging in water may increase the calories you burn to around 350 for 30 minutes. But, 30 minutes is a long time to jog in water. Walk while moving your arms under the water so that they feel the resistance of the water. Make sure you move your arms in different ranges of motion so you exercise different muscles.