The site will be about fitness tracking and active living (think Endomondo). Service tagline will be: "... where fitness & sports become social" or "Let's get fit together" or something similar. It will allow one to track & analyze one's workouts and to motivate each other by discussing them with friends, challenge each other etc.
Keyword Suggestions:
athletes, athletic, body, club, community, crowd, factory, fit, fitness, health, journal, log, logbook, personal, sport, sportive, tracking, training/ add more...