In order to keep your muscle mass you must do some resistance training... it does not matter if it is isometric or isotonic... but you must get those muscles to work...
Also, there are two major types of training... you can train for power or for endurance... if you train to get stronger and bigger muscles... you use heavier loads and fewer repetitions... if you want endurance... you use lighter loads and more repetitions...
Any more questions... feel free to ask...
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