Glossary

Metabolic stress

Metabolic stress is the buildup of metabolic byproducts like lactate in a muscle during high-rep work.

A secondary contributor to muscle growth — the 'burn' you feel during long sets.

Mechanical tension
Mechanical tension is the force a muscle generates against resistance during a lift.
Pump
The pump is the temporary swelling of a muscle during training, from blood and fluid being trapped in it.
Hypertrophy
Hypertrophy is the technical name for muscle growth at the cellular level.

The full glossary

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