Spoken like a true 158-pounder.
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I agree that HS 106-pounders rarely become D1 125s, but in Iowa, a LOT of schools can't field a 106-pounder these days. Or a 220-pounder, for that matter. As far as weights where a guy can wrestle for four years, some guys grow. It doesn't matter what the weight is, there are guys that will stay four years in one class, and others that will move up. maybe multiple times (see Kyle Dake).
I have always thought there should be a weight class somewhere between 215 and 230, but Title IX screwed that up a long time ago. Schools are cutting men's programs even today, using finances and Title IX as an excuse. They are not going to add extra "players" and therefore more scholarships to a non-revenue sport. I think there have been a good number of guys that would have benefitted from that weight class, but as MSU says, it would be hard for many teams to fill that weight class. Football takes a good number of athletes in that weight range out of the equation, and many guys who can play college football (and, in their eyes have a shot at the NFL), will choose football over wrestling. Sad, but factual. As I said before, the career 106 and 113 guys that want to keep wrestling take their game to D3 or NAIA, because they can't compete in D1. Contrary to what is often talked about on here, some people's metabolism at that age just won't let you lift hard and eat well and gain 15-20 pounds of muscle. Some can, some can't.