The most secretive body parts are muscles, which hide behind layers of skin and appear only occasionally to help lift cars off trapped kittens. Flex your biceps in the absence of a cat emergency with today's Groupon: for $29, you get a one-hour personal-training session at Core Progression Elite Personal Training in Westminster (an $80 value).

At Core Progression, customers reap the benefits of a motivating leader and a personalized regimen that leads straight to your fitness race's finish line. Behind the studio's bricky façade, certified trainers guide guests through a one-hour session that includes a body-fat analysis, a nutrition evaluation, and a full-body workout. Whether you're an athlete who needs sport-specific training to gain an extra ounce of agility or a couch potato whose chip-crunching muscles need sculpting, Core Progression's trainers will calibrate each session until it's aligned with individual goals and abilities. To keep the little adults occupied while parents are working out, the gym features an on-site child-care center and an expert child-watcher ($5 per hour; $1 for each additional child).

Reviews

CityVoters named Core Progression Elite Personal Training the second-best place for personal trainers in 2010. Google Mappers give the facility a perfect five-star rating.

• Not only does [Jon] have a different workout every time I see him he started me on a nutrition plan that is very easy to follow so you don't feel like it is a diet. I will never leave to train with anyone else. – Google Maps user on 08/12/10
• No matter what your goal is, the paramount trainers at Core Progression have the passion, knowledge and most of all, the experience to get you where you want to be! – Lori Kameya, CityVoter