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Doing pull ups in 4 sets and doing 20 per set, means you can do 20 pull ups.
If you're going to fully rest and recover between sets... then obviously, you can start again and continue do more.
Furthermore, its requires muscular endurance (lactate/anaerobic), far more than strength and its not a hard thing to achieve if that's your goal or unless you are excessively overweight.
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Yes, fewer illegal immigrants working equates to more job opportunities for American citizens.
Rochard
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