The evidence based lifting crowd loves to dunk on pump training. The pump doesn't cause growth. It's just fluid. You need mechanical tension. They're not wrong. They're also arguing against a point no serious lifter is making. The Three Drivers of Muscle Growth The actual hypertrophy literature identifies three primary pathways: Mechanical tension load on the muscle Muscle damage micro-tears from eccentric overload Metabolic stress the pump All three are real. All three matter. If you're doing hypertrophy work and generating zero metabolic stress, you've left one of the three pathways completely untouched. The pump isn't the goal. It's a signal. It tells you the target muscle is firing, accumulating metabolites, and receiving a genuine stimulus. When you feel it in the right place, you've confirmed the muscle is doing the work not the joint, not a synergist, not momentum. The mistake is chasing it at the expense of load. That's when ...