"How do you start your clients out?" asked the other trainer.
"I just begin them with a squat."
"Me too! First a swiss ball squat, then I move them to the Smith machine, then dumbbells, then -"
"I just start them with a simple bodyweight squat. I find most people can handle it."
"Really?"
"Yes. Of course they might begin with not many reps and a shorter range of motion, fairly soon they're going right below parallel."
"You know it's not necessary for them to go below parallel."
"Why not?"
"It doesn't work their quads any more than above."
"I agree. I don't have them go deep for their quads, I have them go deep to work their glutes and hamstrings. This is also good for their flexibility."
"If they need flexibility work, do that, isolate it."
"That's a fair approach. What I like to do is to pick a few exercises that do a few things at once. A simple bodyweight squat will improve their strength, flexibility, balance and so on."
"Better to isolate it."
"Perhaps. But I ask myself, do they have to sit down and stand up in day-to-day life? Yes. Do they have to stand on a wobbling surface in day-to-day life? I've yet to train a sailor, so no. So I try to work them as they'll work, live, and play sports - on their feet moving their whole body. Thus, squatting nice and deep."
"But that's unsafe for their knees."
"Actually a deep squat balances the forces on the knees, a half squat makes it unbalanced, as the quadriceps pull across the joint more forcefully than the hamstrings under it."
"But the hamstrings aren't involved in the squat. There have been many studies of the electrical activity."
"When you look into those studies, generally you find the squat technique was a bit dodgy. For example one study was of Smith machine squats to well above parallel. Well, most trainers and any coach could tell them that there'd be little or no hamstring involvement in a Smith machine half-squat. That's why I say, go deep with just your bodyweight or a barbell."
"But there's no hamstring involvement in the squat. Studies show that."
"What is the function of the hamstrings?"
"What?"
"Well, the biceps are elbow flexors. The quadriceps are knee extensors. What do the hamstrings do?"
"They are knee flexors."
"And?"
"And... hip extensors."
"A squat involves hip extension. How can you have hip extension without using hip extensors?"
"Well, the glutes."
"And what are the hamstrings doing?"
"Nothing. They're not involved in the squat."
"So the hip is extending by means of the gluteus maximus contracting and shortening, meanwhile the hamstrings just sit there slackly? Squat now, deep, and feel your hamstrings as you stand up."
"I know how to squat."
"Just squat and feel them."
"The studies show -"
"I know what the studies say. Okay, let's say the studies are right, the hamstrings are not contracting during the squat. Answer me then: why do my hamstrings hurt the day after squatting?"
"What?"
"If the hamstrings are uninvolved in the squat, what is happening to my hamstrings which makes them hurt after squatting?"
There was no answer to what I thought was a simple and fair question. Ironically, this same trainer had earlier been saying, "See, we trainers should have regular meetings to talk about these things to make sure we're all on the same page, I don't know why the manager isn't interested in that." I imagine the manager has something against a big brawl starting.