The challenge of aging...

never have the challenges to reach optimum health (and beyond that, yogic integration), been greater, but neither have there been so many tools to help overcome them. Aging brings its own set of difficulties, with the glandular system dying down, digestive functions slowing- making it more difficult to extract what little value can be had from foods raised on nutrient poor soils, circulatory impairment, and all the big and little injuries, emotional and physical, which have gone unresolved. So live each day wisely to enhance longevity to your Self and perhaps retain the possibiltiy of merging once again with your Self.

A modicum of exercise...

this is the minimum amount of exercise required to keep the body's battery charged up. Look at the will power to force movement as an alternator to allow adequate charge production to enhance the battery. This charge can be used for physical or mental output. To run too much energy through the musculature of the body (too much physical exercise) is to excessively discharge potential electrical flow which can be used to build up the charge on the brain; whereas, if not enough physical movement can be produced, the circulation of the cerebrospinal fluid to maintain a strong charge on the body's battery becomes more challenging. Enough physical yoga can perform this function adequately and efficiently. Then this mental power, derived from increased electrical charge in the brain area, can be used to concentrate with, which is the first step to advancing one's Self in meditation.