Bella Hadid Sweats Out a Few Round of Boxing

Bella Hadid will beat your ass in the ring, but you'd probably enjoy it.

The model slipped on the mitts in NYC for a boxing workout with a trainer. This was no photo shoot ... Bella looked serious about the session, and definitely dressed for the occasion.

Her bosses at Nike will be thrilled.

Our only question: Where's the headgear?? Protect the moneymaker at all times, Bella.