Have lifted light weights, heavy weights, done weightless routines, lots of push-ups, cobras, etc. etc. The thing that makes them "cut" imo is losing fat and in some cases, way more fat than I'm willing to lose. Sometimes it's genetic too - the amount of muscle one can gain, I mean. That said, I have had the best luck with surprisingly little weights - regularly doing Squeeze routine with 3 lb weights and then a lot of upper body strength work via planks and upward dogs, cobras, etc.
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