Bone Mineral Density & Osteoporosis

Bone responds to load. Mechanical strain above a habitual threshold signals osteocytes to increase bone formation, which is why progressive resistance training — not walking or general activity — is the exercise modality most consistently associated with gains in bone mineral density (BMD) at the hip and lumbar spine.

The most cited clinical evidence is the LIFTMOR randomized controlled trial, which examined high-intensity resistance and impact training in postmenopausal women with low bone mass. Participants improved lumbar spine and femoral neck BMD alongside functional performance measures, and the supervised protocol was completed without the fracture events often assumed to accompany heavy loading in this population.

For clinicians managing patients with osteopenia, the practical question is rarely whether load helps but whether load can be delivered safely. Supervision, machine-based movement paths, controlled repetition speed, and elimination of ballistic loading all reduce the injury risk that otherwise limits prescription in a fracture-risk population.

This is the mechanical rationale behind the 22FitRx protocol: slow, controlled, fully supervised resistance training on medical-grade equipment, delivered in a private studio rather than a group class environment.