PUSH THROUGH THE PAIN Instagram / @theshanemcmahon
Shane McMahon is back in the gym just weeks after tearing his quad at WrestleMania 39 ... and the WWE talent was in great company -- 'cause he was sweatin' it out with All-Pro Tennessee Titans running back Derrick Henry!!
Shane -- donning a large brace on his left leg -- posted video of his workout on Tuesday ... showing him going through a series of exercises as he attacks his rehab.
The two were accompanied by famous athletic trainer Melvin Sanders -- who works with all the biggest names in the NFL -- as well as Luke Miller, who is Dak Prescott and Zeke Elliott's physical therapist.