Just work on it. Here's a drill I used to do and still do. Set up like 6 cones (markers, baseballs, whatever you have) they should be in lines of 3 from left to right. so by now there should be two lines directly in front of you of three cones each left to right. each cone should be 3 feet or so away from the other cone.
CONE 1 is going to be the first cone in the front row, at cone 1 you will drop straight down to block directly in front of cone 1. after blocking infront of cone 1, explode up (without using hands, use just your legs) and quickly set back up and slide/block towards cone 2 to your right.
From cone two explode up quickly, get set as quickly as you can, and shift/slide/block, whatever you want to call it towards cone 3.
Explode up from cone 3 using just legs and get set at cone 4 which is right above cone 3. block cone 4 then slide on over to cone 5, then slide to cone 6 and repeat this sequence about 3 times or so then rest and maybe repeat it again. now you said that you wanted to develop range but this will give you the "quickness and explosiveness" you need to block those pitches to your side. range is useless if your too slow. just try to be quick.
btw, heres how the cones should look
6 5 4
1 2 3
and remember the only straight away/right in fron of you blocks are 1 &4, the rest are side to side blocks. hope this helps a little bit, just try it and see what ya think.