The family environment is critical and it appears you are taking every step to create that healthy environment.. I mentioend this briefly in an earlier post, but let me add it here to assist. Ideally, try recognize and work with your teens strengths and interests (i.e., what they like to do and do well). Rather than try fix broken things, explore possible interests in activities and start there, even if it is not the ideal activity (this could include play wiifitt as a family to start). The whole idea is to try build self-efficacy (belief that they can do something) and it is crucial to make this a positive experience. If your teen is not competitive in nature, remove that from the activity to start - let them have fun, make sure the intensity, duration, etc., are appropriate (i.e., give them a small challenge to push themselves, again, perhaps completing a wiifit program, but we want to make sure they are successfull about 80 % of the time and no less. Sumer is a difficult time with school off, warmer weather, etc. - teens are often subject to riducle, embarrassment, etc., so a supportive envrionment is critical in performing these activities. What intrigues me is that although a healthy envionrment is provided, your teen still shies away from following in your footsteps. I would suggest asking your teen to identify his / her core values (i.e., what is important in their life today - friends, school, socalizing, socailizing, etc.). then ask your teen to score each on a score of 1-10 (10 being very important). Next ask them to score each on a level of current satisfaction (using same 1-10) scale and it may expose some triggers to undesireable behavior (e.g., opting not to be active). With this information, these areas can be addressed positively, which may impact other parameters of their lives including activity. I hope this helps