I honestly find having cute, fun, maybe a little ridiculous gymwear makes me more motivated to go. I love wearing bright prints and colors and I can’t wear them to work, so I like to wear them to the gym. Kohls has some great stuff and I’d second Old Navy and Target like other’s have suggested. Another option I really like is Kate Hudson’s Fabletics. I know people have issues with the club pricing and all that, but honestly it’s not terribly expensive as long as you remember to opt out of the months you don’t want to buy. They also have some great sales and I was able to pick up a ton of stuff for next to nothing and the quality is almost on par with Lululemon in my opinion.