They can't get zip on their passes and even if they have their dribble can't make an explosive dribble to release the defensive pressure. The ability to decelerate the muscles but maintain tension in them. This is where drills such as jumping hurdles with one or two legs can help you improve. It is important when jumping hurdles however to keep your upper body upright. This forces the legs to do the work which is your goal.
Hurdle jumping also requires body balance and strength, another critical factor in shooting.
Plyometrics are also good for developing jumping strength. Ready means getting the ball into your final shot position before extending upwards and shoot means to initiate the shot. If the caller changes rhythms you will be able to see and feel if you are able to keep the energy in your legs regardless of the rhythm. Doing this drill on a daily basis will also help you to develop the ability to quickly put energy in your legs as well. Always begin your shooting drills well within your shooting range.