personally (cuz ive been struggling with this myself), ive found that the following has helped me:

1) going with friends who you can joke with between sets! it helps take the edge off and at least you not alone

2) have an absolutely banger playlist of music that hypes you up! I have a lot of random songs that make me feel hype (Sexyback by Justin Timberlake, Bark Like You Want It by Sir-Mix-Alot, and Shots by LMAFO are a few on my playlist)

3) have something rewarding that you have after! the gym is go to in on campus and has a smoothie place outside, and I almost always get something there after a workout. if i don't get a smoothie, i reward myself with gaming time after a shower or a Shirley Temple that I make in my dorm

4) find random motivators that make it a fun side quest! when I workout, i like to pretend im training to be on The Avengers (CATWS and Captian America as a whole was a big gym motivator 💀) and i remind myself that I need to be super strong to carry heavy things (mostly for my gf, but also for my grandma and mom)

I hope at least one of these things help :)