I typed a long response and Yuku fucked up. Dammit! OK, if you're wanting to try yoga class, go to a yoga studio. It's more than just exercise and the focus is on the spiritual aspect of it. Try a beginner's level and stay away from Power Yoga, Ashtanga, and Bikram until you're comfortable doing the poses. Yoga mats are not that expensive and I would suggest buying one. You can buy one at Walmart. If you're wanting to stay at the gym, don't be discouraged about what other people are wearing. Just focus on you and what type of exercise you're doing.