When Joe McKnight shed weight this offseason he may have gone a bit overboard. He failed his physical earlier in the week and suffered from dehydration in yesterday’s practice results of having too little body fat he said.

“I’ve just got to get my body fat up right now’’ said McKnight who struggled midway through yesterday’s second practice of Jets training camp at SUNY-Cortland dropping to one knee during a break and being attended to by a trainer.

The fourth-year running back initially failed his physical administered in Florham Park before the Jets departed for Cortland. He passed later in the week and was taken off the physically unable to perform list practicing the past two days.

“I’ve just got to get my body fat up to keep me from cramping a lot just stay hydrated” he said. “It’s hard drinking a lot all day because in the middle of the night you have to keep getting up to go to the bathroom but it’s just something I have to stay focused on and just do it.’’

Two years ago McKnight added weight in an attempt to become more durable. Then he shed weight to get quicker. He may have shed too much finishing last season at 4.0 percent body fat and coming into camp at a scant 3.3.