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I pretty much believe with planking, sir. Although the pec dec machines can make your shoulder joints vulnerable it also targets you frontal deltoids and latismus. Cabled flies are for isolation and if tension occurs there might be slight angle changes that would change target muscles, unlike the pec deck you have no choice but to abduct your arms at the same angle. And bench press vs. Push ups. I really don't recommend changing but more of doing it both. If your target is your chest or upper body resistance 100 push ups a day is pretty recommended. As for strengh and development of muscles bench press is useful for it is weighted.