Michael Myers was killin' it at the gym this week.
Sorry, had to.
Former pro pitcher Logan Chitwood gave meatheads a scare at the gym this week -- by dressing up as the "Halloween" villain and getting in a workout!!
The hilarious prank was caught on video ... showing the YouTube star working on his biceps and triceps while decked out in the slasher's navy jumpsuit, mask, wig, and boots.
Chitwood stayed in character the whole time -- you can even see him holding a fake knife while pullin' this off ... but he did struggle a bit when he tried to do a one-armed pull-up.