Is medium firm the best tension for back sleepers?
Although it is important to consider your own personal preference, the versatility of this mattress means it can be beneficial for back sleepers and it would be better than a softer mattress, they would gain more benefit from firmer spring tension. It's a similar situation for side sleepers, a medium firm mattress would be a better option for them than a firmer mattress however, they would receive better postural support from a softer mattress as it would cushion their shoulders and hips more effectively.