I am a junior in high school and I lift regularly. However I also play tennis, and in a few weeks my season will be starting, which means tennis six days a week and lots of overhead motions (well, just one, really).
I do plan to keep on lifting, but my question is how should I address the possibility of shoulder tendonitis/other issues that could arise? (Right now I train shoulders with mostly behind-the-neck barbell presses). Should I continue doing this? Switch to front presses? Dumbbells? Any knowledge anyone could share would be appreciated.