Pump it up until it is firm, but not too firm.
Bounce it on hard to firm ground, it should bounce from dropping it from your waist height up to your waist height.
DO NOT pump it up by compressor, ALWAYS use a HAND PUMP.
Ball have been known to EXPLODE.
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There are 13 psi, or pounds per square inch, of air pumped into an NFL football. Wilson is the only US maker of NFL balls.
Approximate pounds per square inch for a football is 13lbs. But this is an estimate.