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.
It's an everyday activity that mankind has been doing since the dawn of time, but if you're walking for heart health you have to do enough of it to really stay in shape. Doctors say that when it comes to walking for fitness, the magic number is about 10,000 steps -- which works out to walking about 5 miles. And in a recent study, walking that distance proved critical to both cardiovascular fitness and blood sugar levels.