What types of blood cells are there??

Any help is appreciated.

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)

Ithink the answer is b hope this

You would modify how often you work out in reps and sets and also modify calorie intake

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