Hey i'm 17, 5'8 at 205lbs. I am a little on beefy side, but i've been lifting weights on and off for 3 years, so i've gained some pretty good mass. But in the last 3 or 4 weeks, i've started getting serious, doing upperbody workouts 3 days a week. I've started eating a lot healthier and i take whey protein and a multivitamin.So here's my problem- i want to get more definition and cut in my arms,shoulders and chest. Can i do this while still building mass? I was thinking maybe i could do mass for 2 days,then tone the other day.Or should i just do toning all 3 days? I've also read doing legs exercises burns a lot of calories. i haven't done legs before, but if this is true than i will start doing them to lose more weight. Any suggestions would be helpful, thanks