A shot with back to opponent is difficult and can injure wrist while turning torso towards opponent or hit leg/knee. It can require flexibility in places such as back, shoulder and hands. Luckily, there are multiple ways you can handle the situation where you are too late or in wrong position which forces you to awkward position with back to your opponent.
How to deal with tennis shots with back towards the opponent?
Things to avoid? Avoid the shot between legs altogether? Any other shots to replace the shot between legs? Safer shots? Replace the shot between legs with parabola shot where you just get the ball to the other side?
Flexibility required for the shots? Pros and cons? Surprise element versus convenience?