br "Through Calculated Nutritional Timing, We can Stop Arm Pump Completely!" br Steve Smith, Former Australian State Motocross Champion br br -Science proves that the body sends large amounts of blood into a working muscle that is producing lactic acid in an attempt to flush it out. br br -Arm pump is simply just muscles full of blood as a result of too much lactic acid production.. br br -If you had less lactic acid, then less blood would need to be sent into that muscle.