I'm 6'4", 300lbs.+ and am looking to get back into cycling for fitness, primarily on paved trails and the road. I'm ready to buy a Trek 7.3 or 7.4 or a Quick 4 as I like the more upright position afforded by the flat bars. However, I just keep coming across posts on this site where people are saying if you're cycling for fitness you should be riding a dropped bar. You're not getting as much of a workout with a hybrid...

Thoughts?