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How much time do you have to spend?
Under the muscle confusion principle its optimal to change your workout every 8-10 weeks anyway.
A runner gets better (lowers their time) because the body has gotten used to the amount of stress being put upon it. The anaerobic/aerobic threshold takes long to cupple thus the naggin pain in the side subsides, legs go further without aching, and so on.
In weight training you actually (injuring) your muscles in a sense. This is why the soreness is sometimes present. You spend whatever amount of rest time (varies) recovering from the stress. The muscles grow in size and are able to handle the same stress better thus you go up in weight. This continues until a plateau is reached: the maximum amount of weight that can possibly be lifted for that particular exercise (naturally), or lean mass growth reaches its peak. the plateau happens because the body has gotten better at whatever particular workout you've bestowed upon it. It takes fewer muscle fibers than it did when starting the work out. If the goal is size this is not what you want.
JUst as the body has grown accustomed to the workout you probably have a comfort level in, changing things up (done in many ways) throughs it back into a state where its forced to use a maximum percentage of it physical tools. THis means you'll be sore more often. Its a good day when you learn to love the pain.
The problem is most people dont give their body adequate time to rest or stretch out everyday. Remember your size is coming from when you rest not when your tearing it down.
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To confine our attention to terrestrial matters would be to limit the human spirit.- Stephen Hawking
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