Jason Pierre Paul -- Thumbs Nose At Critics ... I Can Still Lift Weights!

7-fingered bench press? No problem.

After critics said Jason Pierre Paul's disfigured hand would be a huge hurdle when it comes to weight training, the NY Giants star hit the gym ... to prove he can still lift weights, despite missing digits.

JPP busted out a set of bench presses -- with a towel in his right hand to stabilize the bar.

It's the second time Jason's posted training footage -- in an effort to prove he can still be effective in the NFL after seriously damaging his hand in a fireworks accident.

You convinced?