How much resistance training do you actually need, and is there a point where more stops helping? We trace the "lift weights twice a week" recommendation back to the 1989 study it came from, which found that three days beat two, and to the citation loop that turned it into a guideline anyway. Then we go through the evidence on whether lifting is dangerous, including the heart, injury rates, and the J-shaped mortality curve, and work out where the dose-response actually saturates for strength, muscle mass, bone mineral density, and how your body handles fuel.

The short answer is that almost every number in this literature marks where a benefit starts, and very little of it goes far enough to show where a benefit stops. We finish by writing the resistance training guideline the way we think it should be written, with target outcomes, a training dose, and testable targets.


Timestamps 

  • 00:00 Where the "lift weights twice a week" rule came from 
  • 04:18 What actually counts as resistance training 
  • 06:56 Does lifting make your heart wall thicker 
  • 15:34 Anabolic steroids and the heart 
  • 19:16 Injury rates and cardiac arrest at the gym 
  • 22:03 How the lifting J-curve got made 
  • 28:05 ACSM audits its own recommendation 
  • 31:11 Strength: where the plateau actually sits 
  • 35:49 Why grip strength can't answer this 
  • 41:43 Muscle mass versus muscle function 
  • 44:50 Bone, and the turkey wing that settled the dose 
  • 49:50 Fuel handling, insulin sensitivity, and the clock 
  • 1:00:46 The 2018 guidelines, and how I would write them

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