Working out frequently build muscle mass faster. There is a lower bound of frequency/intensity below which there is no significant muscle gain. Everyone is constantly using their muscles, but people don’t automatically become stronger as they go through life (just the opposite, in fact!) There is also an upper bound where pushing harder does not significantly increase gains and may lead to injury.
A separate issue is that muscle growth is faster for someone who has just started working out than for someone who has been working out for a long time. The man who gained 5 lb of muscle mass in 3 months should expect to gain less in the next 3 months.
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