weird metaphor, because a gym goer practices what they are doing by putting in the reps in order to increase personal capacity. it's more like you're laughing at people at the gym, saying "don't you know we have forklifts already lifting much more?"
I can buy “if you use the forklift you’ll eventually lose the ability to lift weight by yourself”, but the author is going for “the forklift is actually not able to lift anything” which can trivially be proven wrong.