The term "knee damage" can encompass many different conditions and injuries so let's just examine at some of the more common ones you might be looking at:
Osteoarthritis of the knee is when the cartilage in the joint has become thin or worn and the body is unable to "keep up" with repairs. Walking generally isn't going to cause this unless ...
Basal Metabolic Rate is the minimal rate of energy expenditure per unit time by endothermic animals at rest. Several BMR equations exist but the most notable one was the Harris-Benedict equation (revised 1984), which was created in 1919 and was the 'best' until 1990 until The Mifflin St Jeor Equation.
These equations use the same factors:
1) Walking can actually help, even in people who already have osteoarthritis.
Daily walking and the risk of incident functional limitation in knee OA: An observational study (Arthritis Care Research, 2014):
Walking over 7 days was objectively measured as steps/day within a
cohort of people with or at risk of knee OA from the Multicenter
Studies do suggest the existence of "muscle memory", possibly related to the nuclei of muscle cells (myonuclei). See here for instance. Still, the precise dynamics and hysteresis of strength and their causes do not seem to be fully explored yet.
The wide push-up recruits more of your pectoral muscles while a regular push-up shares the burden with your triceps muscles. According to a small study of eight people, when subjects dropped to their knees to modify the wide push-up, also known as the abduction push-up, they saw a drop in overall muscle activation in the upper body. However, when the same ...