Celia Duff, 70, was always a casual exerciser but started doing intense fitness competitions three years ago.

That had begun to change in the late 1960s, when the future Nike co-founder Bill Bowerman and cardiologist Dr. Waldo Harris ...

For those over 70, walking is a low-impact exercise that's easy on the joints while delivering life-changing benefits like better endurance, sharper focus, and reduced risk of chronic disease.

Hollywood trainer Jason Walsh broke down how to get your New Year's fitness resolutions off to a ... which can be the enemy of results — and to use his 70/30 approach to really see results.