I agree too. upper-cuts are for close distance fighting...unless you throw what appears to be a kind of underhand jab. it's not really an...
Well it doesn't make sense to jump back into shooting range. Try moving to the sides. I agree with many of the other comments...stamina is a must....
Freddy Roach aslo says to throw it with your palm facing down. I thing to consider as well is your elbow. You run less risk of injuring your elbow...