EF13 Muscle :- It
really isn't easy to perform pull-ups and chin-ups, but it sure is worth it to
do them because you'll quickly gain muscle mass, without a doubt. Performing
this exercise usually takes ten seconds for a repetition: five for the ascent
and five for the descent. About 3 to 4 repetitions of this exercise are
probably enough, especially for beginners, who wont be able to do more than
this and will benefit from muscle mass increases. Medicine Balls: Using
medicine balls is the hard part.
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