Performing a single-leg seated calf raise with 1.5 times body weight for six reps is a difficult performance metric that Peter Attia has not yet achieved.

“I actually had to download I was luckily I had my phone I was able to download the paper you sent that walked through the protocol and you're doing a single leg calf raise where one one foot is doing all the work obviously the other one is not you got a lot of padding on top of the lower femur so that you can load the bar from the Smith machine directly over the tibia and fibula and you I think it was six reps you had to do if I'm not mistaken at 1.5 times your body weight and I think I got up to 1.3 times my body weight and I was like is there any way a human could do 1.5 times their body being clearly there is but I was blown away at how difficult that was”