As it turns out, there is a buy-in to be part of the Bears’ defensive huddle this year for starters and reserves alike. Safety Alex Cook re-signed with the Bears Thursday after he had been with the team briefly during OTAs, and when the former Panthers player reported to Halas Hall on Day 2 he was told he had to do the same up-downs the rest of the defense did on Wednesday. “We had a guy, Alex Cooks, who actually reported here and got released and actually they signed him in I think yesterday,” safety Kevin Byard said. “It kind of felt bad watching him do them by himself but at the same time it’s just like that’s one of those deals, the initiation of this defense, like, and then once he finished everybody was like ‘welcome to the defense,’ then got on with practice.”