Aside from the injuries, one of the bigger complaints NY Giants fans levied towards their now-former player Hakeem Nicks was his lack of commitment. Call it laziness. Call it a lack of heart. Call it whatever. In their minds, Nicks simply did not do enough to stay healthy and get better.
Whether this is the truth or not is almost irrelevant. It's an issue for Nicks. Apparently, in 2014, he plans to do something about correcting the impression that he lacks dedication to the game of football. From Mike Florio at PFT:
Per a source with knowledge of Nicks’ plans, he’s promptly heading to The IMG Academy to train with players preparing for the draft. His goal will be to get himself into peak physical shape for offseason workouts, in order to make an immediate impression on quarterback Andrew Luck.
Florio also adds that one of the other teams reportedly in play for Nicks, the Carolina Panthers, weren't seriously interested in signing him, which played a part in Nicks deciding on Indianapolis. Florio also notes that the money invested in Nicks's one-year deal is $4 million, including a per-game roster bonuses and up to $5.5 million with incentives.
Basically, Nicks is highly motivated to remind people that, a short time ago, he was considered one of the league's premiere wide receivers. As to whether or not Nicks is healthy now, after dealing with foot and knee issues all throughout 2013:
Like you, the #Colts wondered about Hakeem Nicks' health. He passed a physical with flying colors, from what I'm told. Helped close the deal— Stephen Holder (@HolderStephen) March 15, 2014