Short chains of amino acids promise big breakthroughs in the gym. We asked the experts whether peptide stacking lives up to the hype.

Lie on a flat bench with a dumbbell in each hand, palms facing forward. Start with dumbbells over your chest and press the dumbbells up until your arms are extended. Lower the dumbbells slowly until ...

For these exercises you’ll need two sets of dumbbells: a heavy pair and a lighter pair (make sure these are around 30-50% ...