Jared Sullinger's trainer posts shirtless workout photo

Boston Celtics forward Jared Sullinger has a critical season ahead of him. It's the last year of his rookie-scale contract, and the 23-year-old needs to prove he can stay in shape and healthy if he wants a big-money, long-term contract from Boston.

There's been so much talk over the past few weeks about Sullinger's improved work ethic that his trainer, former NBA player and coach John Lucas, decided to tweet a shirtless workout photo to prove it.

Does Sullinger look ripped? Not really, but it's good to see him putting in the effort to slim down. If he can still be one of the league's best rebounders at a lower weight (and play over 30 minutes a game), his value could go through the roof. 

And an improved three-point shot wouldn't hurt.