I love working out at Curves for Women. The 30 minute workout circuit isn't too hard for beginners to jump in, but you can consistently get a good hard workout as you get stronger and leaner just by working harder on the circuit machines and in between. All of the staff at the Chino Hills North location are super friendly, and the women who work out there are nice as well. Unlike most L.A. area gyms, you don't have to worry about looking good to go work out - everyone is in baggy t-shirts and shorts and no one is trying to impress anyone else. The jazzy music helps the time speed by in a flash. They also have really convenient hours, although I would like to see longer hours on Saturday and for them to be open on Sunday.