I have a book that recommends stuff for tennis players.
For jumps, "slalom jumps" and multiple hops, and 1 leg jumps. Kind of trying to combine jumping forward, and to the side, like angles.
advancing to the net from the back of the court. Accelerate, then stop at the net.
Long shuttle. Back and forth, on the baseline, from single sideline to single sideline.
Short Shuttle-on the baseline, from the center line to the single sideline and back
"Fan"- Five, 4 meter sprints, from the center line to zones on the court, then backing to the center line, in a fan-like pattern.
The book recommends holding a racket and facing the net as much as possible for the sprints.