I really love body-weight exercises for hotel rooms as well as exercises that can be used with a resistance band (which is easy to travel with).
Here are a few good moves for the whole body (which of course you would need to deem appropriate for your clients or modify if needed):
You could do a circuit of one-minute exercises, and repeat 3x:
Pushups (on toes or knees)
Squats/Squat Jumps (modify if needed)
Planks (all kinds–front planks, side planks)
Burpees/Jumping Jacks (modified to low-impact if necessary)
Hope this helps and good luck!