Simply try and replicate weight transfers that you would experience on the court.
You can go to the gym for that, you can use rubber bands, shadow "stroking"
Try to replicate the pace of the match, this is the most important. Do any exercise and pick weights so you could do a 15 second set at a relatively fast pace, then a short break and a repeat. You should feel tired after the first 15 second set....meaning you should squeeze out these last repetitions. Don't count repetitions, not important....just keep a track of the seconds.
What you essentially be doing is replicating points during the match and targeting the right, fast twitch muscles.