^ Yes, a properly performed split step will make your next movement more explosive. This is due to the
stretch-shortening cycle (see links below). While an athletic position in the balls of your feet with the knee bent will provide some advantage, a
well-timed split step should provide an even greater advantage.
http://en.wikipedia.org/wiki/Stretch_shortening_cycle
http://www.ncbi.nlm.nih.gov/pubmed/10899328
To the OP: Keep practicing the timing of your split step. A poorly timed split step can be counterproductive. If too early, it is not too bad -- you effectively get the static athletic position that you described. OTOH, if you're late, it will delay your move to play the ball. Some pro players will split step as they hear the contact made by their opponent. However, this might cause a lot of players to be slightly late. Many players will initiate the split step on the opponent's
forward swing (or upward swing for a serve) before contact such that they land just as the ball is coming off the opponent's strings. Do not start your hop/jump before your opponent's forward (or upward) swing.
With practice, you should be able to find the optimal time for your split step. Note: If you are early or on-time with your split step, you will probably land with your weight equally distributed on the balls of both feet. If you are slightly late, you might find that you are landing on just one foot and starting to move the other foot in the direction that you want to run.
For
LeeD and others that might find a conventional split step too painful, there are a couple of
modified split step variations that might be of use. One of these is a split step movement that is sometimes employed by
badminton players. Instead of a dramatic hop/jump, badminton players will suddenly lower the body as the opponent is making contact (or about to make contact) -- increasing the knee bend and temporarily unweighting the body. This movement, if performed correctly, should produce a stretch-shortening cycle. Like a conventional tennis split step, this lowering/unweighting movement needs to be well-timed for optimal effectiveness.
Another split step variation is something known as the
fastso split step. I sometimes refer to it as the
geriatric split step. Here is Coach Mauro's split step variation:
http://fatsotennis.com/tag/tennis-split-step
http://tt.tennis-warehouse.com/showthread.php?p=5500841#post5500841 (posts #5 and #9)
.