Decades ago players used offseason workouts to get in shape. Now they arrive in peak condition and go from there. So it was somewhat surprising when second-year running back Karlos Williams showed up in Buffalo carrying an extra 20 pounds. The Bills opted to hold Williams out of practice, and here's how the running back explained the decision, via ESPN.com's Mike Rodak.

Reporter: What injury has been holding you back right now?

Williams: The injury of pregnancy, I would say.

Don't think you're going to be able to check that box on the injury report because, well, "the injury of pregnancy" doesn't sound like a real thing. But Williams can explain when it comes to his wife's pregnancy.

"It definitely is a first, but I like to eat, and then her being pregnant gave me an excuse to eat, so eating anything and everything," the running back said. "She'd wake up one or two o'clock. 'I want a snack.' Well, I'm not going to sit here and watch you eat because I don't want you to feel bad, but it's back to football. She's getting back to working out herself, so kind of motivating each other, feed off each other's energy, and we're getting ready for camp."

Bills coach Rex Ryan, who has had his own struggles with weight, was unimpressed, telling reporters that Williams was "obviously not anywhere close to where he needs to be to play at a high level."

That said, there is no drastic weight-loss plan in Williams' future.

"We're not going to put a ridiculous weight number on him to get him back," Ryan continued. "But what you don't want to do where he all of a sudden drops 20 pounds and he comes out here and gets hurt the first day of training camp. That's what we're trying to avoid. So we've got to get him to do the right things now. ... So we've got to get some weight off him and he understands that."

Williams, a fifth-round pick out of Florida State, played in 11 games as a rookie, rushing 93 times for 517 yards (5.6 YPC) and 7 touchdowns.