Well, on my side I have no problem with strength. I can do 14 chin up, plenty of push up and sit up. But I think I have focused more on the upper body strength. So now I have added lot of legs exercises on my training, so I hope it will help with running. (Leg press, dead lift, lunge, squat, etc.) I try to make it really cardio vascular too.
Biking is a good idea, but again, it's not the same as running, I'm way better on a bike. My Cardio is really good in a pool, but when I run, I become tired rapidly, so I guess it's really a muscular problem. They are probably too weak and use too much energy. Also what is cool in a pool, it's that you stay cold and fresh, I don't like to be all sweaty. On a bike, same thing, lot of air flow to keep your temperature low.
But no mather what we like/dislike, the fact is that we have to run, and I will do everything I can do be good at it, and for that I need to keep running.
Thanks all, for those who are leaving in September like me, keep running and I'm looking forward to go for a run with you