The main problem has always been noncompliance. Many real issues may deter someone from embarking on an exercise program: obesity itself, joint pain, neuropathy, peripheral vascular disease, back pain, and heart disease may all combine to make exercise difficult or even unsafe. Overall, however, I suspect the biggest issue is lack of visible results. The benefits are greatly overhyped and exercise doesn’t work nearly as well as advertised. Weight loss is often minimal. This lack of results despite great effort is demoralizing.
