I use this suit all the time. Despite appearances, it stays put, I swear! I had my doubts, but it truly is a very functonal suit. I swim masters at least three days a week and this suit is holding up and doing its job, less the tan lines. The only thing I might fix about this suit is to make it completely polyester instead of just mostly polyester, because it does have a little more give than most polyester suits.

The swimsuit is tight enough as I need to work out hard in the swimming pool

The cut of the suit is wonderful if you're sick of one-piece tan lines.  It stays on great in the water no matter what you're doing.  

I had to order a size up and still the butt is tiny.

I swim on a competitive swim team, and this suit is great! It stays put during flipturns and everything and you get way better tan lines then with a one piece!

I love this suit.  I wanted a "bikini" with a little flair, yet one I could work out in.  This one fits well, has moderate coverage, and stays put when I exercise.