Strongly recomend s4, in old days (now i m 44) i was powerlifter too (185 kg bp, 235 kg dl, 265 kg sq in under 90 kg category). Started training im May this y again after 15. y . Now 5 w on s4, on low carb diet, lose 20 kg (~40 lbs) in just 3 months, strenth went crazy starting s4 on low carb...