Most people think a set must be continuous to count. Cluster sets add 15-30 second micro-rests mid-set, letting phosphocreatine partly restore so bar speed and form hold across more heavy reps. Action Tip: Try "The Mini-Break Method": on your heaviest lift, do 2 reps, rest 15 seconds, repeat until 6 reps. What's your current heavy-set habit? Vote below, then comment: when does your form slip?