Acefitness.org

Price: Free

Best for: Learning new moves

The skinny: This site has all kinds of exercise advice.  All the personal trainers are certified.

Fitday.com

Price: Free

Best for: Counting calories

The skinny: This web-based diet-and-fitness journal lets you track what you’re eating by calories, carbs, fat, fiber, and protein.  It also calculates calorie burning and helps you chart your progress toward goals.

Logyourrun.com

Price: Free

Best for: Recording your runs

The skinny: You can log everything a runner might track, from the sneakers you wear to what routes to take to the events you’re training for.  Follow free training programs and then track your progress.  It syncs with Facebook, so you can share your runs with friends and has an iPhone app that uses GPS to record your mileage and time for every run.

Mapmyhike.com

Price: Free

Best for: Finding and sharing hikes

The skinny:  This site offers an interactive training calendar, workout and gear trackers, calorie and heart rate calculators, a journal for notes about goals and challenges, and info about local races.  This is the sister site to Map my Run, Map my Ride (for cyclists), Map my Walk, Map my Tri (for triathletes) and Map my Mountain.

Sparkpeople.com

Price: Free

Best for: Getting pro tips

The skinny: This site will create a personalized diet and fitness plan for you.