Another bad ass notch on Adrianne Haslet's belt ... 'cause the woman who lost her leg in the Boston Marathon bombing -- is now BOXING with George Foreman's son!
Haslet was training with George Foreman III earlier this week at his EverybodyFights boxing gym in Boston.
FYI, GF3 was a pretty good boxer himself -- racking up a 16-0 record as a pro.
It's another impressive feat for Haslet -- who already completed the 2016 Boston Marathon on a prosthetic leg ... and picked up ballroom dancing again after the incident.
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