Nope. If I was a high school football staffer, I'd want them to do anything in the winter, spring, & summer. Whether it was wrestling, basketball, hockey, swimming, or etc in the winter time. Same with baseball, track, lacrosse, freestyle & Greco-Roman, & etc in spring/summer. Use different muscles & skill sets! Add in some weight lifting in the weight room as well as outside the weight room. Handle those small square hay & straw bales on the wagon & in the hay mow/loft. Work with stubborn steers, heifers, calves, pigs, sheep, goats, horses, and etc. Just make sure they take some down time in between to be kids. Fishing, mushroom hunting, and night crawler hunting can sharpen skills too.