It's like the first day of school for NFL players heading to training camp

It's time for football.

Washington wide receiver DeSean Jackson talks with Santana Moss and Andre Roberts during practice on day one of training camp. 

Geoff Burke / USA TODAY Sports

'Tis the season for NFL training camps, when positivity is in the air and players pack up their lives for a return to the gridiron.

By this Friday, every team in the league will have broken camp (except the Detroit Lions, who officially open camp on Monday). Judging from players' messages on Twitter and Instagram, most of them are itching get back to their teammates and prepare for the 2014 season.  

It's like the first day of school all over again. Only when NFL players go to school, they put on pads, hit sleds, study playbooks, bash one another and occasionally get into team-building brawls. Football! 

Here's what they're saying:

And here's how Bears linebacker D.J. Williams handles the transition from home living to camp:

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