Mammoth technology came out of clinical pressure care. It is now under the mattress you recover on.
Two hours on the road loads the hips, knees and calves, and leaves the pelvis working unevenly. Most runners then sleep on their side. The hip has to sink without the waist collapsing, so the spine stays in line.
Long holds fatigue the lumbar spine and hips without any impact at all. The surface has to stay even under a body that has spent an hour at the end of its range. Back needs holding while the hip is still free.
Short intervals stack impact and fatigue into forty minutes. Landings and changes of direction go through the knees and ankles. Spreading all the weight means a sore joint is not carrying it alone all night.
Pressing, pulling and loaded squats fatigue the shoulders, thoracic spine and lower back. A heavy upper body needs the shoulder taken deeper than the ribcage. That is a job for zoning, not for a firmer mattress.
A healthy lifestyle choice.
