“…While 24 h/day prolonged bedrest leads to deconditioning of multiple systems, a response that parallels responses to microgravity during spaceflight, a less intense but an equally serious form of “deconditioning” can occur with implementation of a sedentary lifestyle where the ratio of time/day spent in physical activity declines to the point where the risk for loss of system integrity becomes more pronounced (Thijssen et al, 2011 ; Nosova et al, 2014 ; Hughson and Shoemaker, 2015 ; Canu et al, 2019 ; Eanes, 2021 ; Perez-Lasierra et al, 2021 ; Stoner et al, 2021 ; Wilson et al, 2021 ). The development of this so called “sitting disease” has evolved in populations of both adults and younger individuals spending large amounts of their day sitting due to their occupation (e.g., sitting in front of a computer or at a desk all day), watching TV, or occupied with electronic devices rather than engaging in normal physical activities such as walking where ground reaction forces require work again the forces of gravity, or engaged in various forms of exercise (e.g., aerobic or resistive) (Dunstan et al, 2021 ; Hwang et al, 2021 ; Stoner et al, 2021 ). Thus, when activity levels fall below a threshold for maintenance of system integrity, the “use it or lose it” principle appears to become activated even though the inactivity is not constant as during 24 h/day bedrest.…”