Running: During my run, these stayed in place pretty darn well. The waistband almost completely stayed where it was supposed to, and the material was thick enough to keep me feeling like everything was held into place.
Yoga: During yoga, on the other hand, I had some problems with the waistband. It rolled down a few times, which I honestly expected, but because the material is a bit on the thick side, it's more difficult to quickly situate it back into place to keep going with your practice. The rolling was minimal, though.
Overall: I'd definitely work out in these pants. For the price, they're a great option, and the level of thickness of the material keeps me feeling like everything is in place. However, I'm more inclined to wear these to work out when the weather was cooler, because they do get a bit toasty.
Try them: 90 Degree by Reflex Printed Yoga Pants ($20, originally $88)
