Sounds like a copout to me....
It is a well-known fact that by themselves, the legs, even individially, can be extremly powerful. And the science says that neurologically, your output from 2 limbs cannot resemble a sum total of what each limb can do individually, as the nervous system has only so much control to go around. And it is a VERY well known fact that a week link in the chain will not allow for good results overall, regardless of the capabilities of each individual part.
Boyle even pointed it out himself. But is not addressing the fact that the load difference on the core of the body between a back-squat with both legs, and a squat on one, is vastly different, that there is a huge difference between 115 and 230, and that if their lower backs cannot keep up with their legs, that they should strengthen their lower back and trunk.
To me, it is a copout, and shameful for someone who trains athletes, and should be focusing on improving them as a whole, instead of as a collection of individual parts. He should be having his athletes work on both, as one-legged and two legged squats each have their place.
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