Is Mobility Training good for joint & mobility?

The evidence points that way, though it's not yet conclusive. Mobility-focused exercise has meta-analytic support across several populations: ankle and foot exercises improve strength, balance and reduce falls in older people, and structured exercise improves strength, balance and mobility in people with cognitive impairment or dementia and in multiple sclerosis. That's reflected in an evidence score of 62/100 for its role in joint & mobility, drawn from 7 studies, with an estimated impact on longevity rated moderate (35/100).