My one biggest weakness when I roll is that I gas quickly. Usually after 5 minutes my energy starts draining and after that I can only last another 5 at best. At times I get so tired I don't even have the strength to push the other guy off. I used to think its was due to poor cardio but my cardio has steadily improved from doing jiu-jitsu for the past few months yet I haven't gained a whole lot of endurance. So it occured to me that maybe a lack of strength is to blame for my muscle fatigue. Would it help my muscular endurance if I started lifting weights? I hate weightlifting and avoid it like the plague thinking the BJJ will be enough to improve my strength but if it would help I would definately do it. I'm can't train right now cause of an arm injury but in the meantime I'd like to do some exercises to increase my endurance.