There is not really anything that can actually replace the pool but I usually recommend that people use either the row, jacobs ladder, or versa-climber machines as a substitute since they are low impact and full body workouts.

I would use the stair climber or Jacobs ladder with a weight vest on.

You can’t really replicate pool workouts, but I would use a row machine or the versa climber/Jacobs ladder. Just something that is low impact and uses upper and lower body.