Can the Trainer be used for serving practice?
Yes. Put the Trainer into “Front Only” mode, and set it at one of the higher levels (levels 14 to 16). Then, after you calibrate it, the Trainer will only give you feedback if you drop your head below the horizontal plane after your serve. Practice your serves as usual, and the Trainer will help you keep a balanced posture as you follow through your serving motion, allowing you to remain in balance whether you rush the net or remain at the baseline.
