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Pro Gamification keeps you motivated
Earn points, unlock achievements, take on challenges and quests and level up. Seeing progress, getting rewarded for activities and reaching a set threshold feels nice and helps in continuing to be motivated. Especially when just starting out.
There's even a leaderboard so you can compare your progress to your friends.
Pro Engaging community
You can post updates on progress and have other people comment on it, encouraging to keep working out. You can ask questions and a community of more than 1 million users will be there to answer.
There is a paid option ($4.99/mo or $44.99/yr), called Hero, that adds private messaging, ability to challenge a friend in an activity, assign yourself a title and weekly insights among other things.
Fitocracy has solutions for all manners of workout regimens and styles.