I just loooove Fabletics leggings in general! I especially like the high waisted one, since they hold everything together nice and tight. I love the pocket on this one, although I think it would also be great to have pockets that are not mesh so that whatever is in the pockets can't be seen.
I also noticed that due to the heather fabric it looked a bit like I peed in them after sweating a lot, but then again you're at the gym and everyone should be sweating, so no biggy! :)
Franziska recommended this style