Im 35 year old women, truly average build but with a slipped disc issue, and I had been relegated to sleeping on the sofa for several months due to developing lower back pain in the night sleeping on a normal mattress, I really thought I might be there for life, but this mattress has allowed me to sleep in a bed again, allows my hip to sink into the mattress and keep my spine supported, Im slowly strengthing my core and the pain is receding during the day as well. Cheers!