Hilaria Baldwin wasn’t about to gatekeep her gym-honed bod — she tossed out a few fitness tips while rocking the tiniest workout set ever … just in case her fans needed a little visual motivation.

Check it out … Alec Baldwin stays winning, ’cause Hilaria hit the floor in a baby-pink sports bra and red undies to demo proper form for legs, butt, abs, and lower back … though LBH, nobody was tuned in for the tutorial.

Hilaria dialed the sexy all the way up … kneeling on a plush bedroom carpet and arching back, all to give those washboard abs their moment.