A simple example of an eccentric contraction is to hold something in your hand with your elbow bent. Slowly allow your elbow to straighten out while holding the weight.  You can visualize your bicep muscle lengthening as you are holding the weight while you are slowly straightening your elbow.  This is an eccentric contraction or eccentric loading of your bicep muscle.
These small exercises may sound like a lot to remember, but you can just start one-at-a-time until each thing becomes a true habit. The trick is to associate exercises with mini-cues. Tell yourself that “If I take the elevator three floors or lazily brush my teeth without squatting, then I am missing a huge opportunity for growth.” Once you have internalized these habits and associated them with a cue, you won’t really have to think about exercising at all.  It just happens.

Jump up ^ Zhou Y, Zhao M, Zhou C, Li R (July 2015). "Sex differences in drug addiction and response to exercise intervention: From human to animal studies". Front. Neuroendocrinol. 40: 24–41. doi:10.1016/j.yfrne.2015.07.001. PMC 4712120. PMID 26182835. Collectively, these findings demonstrate that exercise may serve as a substitute or competition for drug abuse by changing ΔFosB or cFos immunoreactivity in the reward system to protect against later or previous drug use. ... As briefly reviewed above, a large number of human and rodent studies clearly show that there are sex differences in drug addiction and exercise. The sex differences are also found in the effectiveness of exercise on drug addiction prevention and treatment, as well as underlying neurobiological mechanisms. The postulate that exercise serves as an ideal intervention for drug addiction has been widely recognized and used in human and animal rehabilitation. ... In particular, more studies on the neurobiological mechanism of exercise and its roles in preventing and treating drug addiction are needed.

Recruitment criteria were one or both of sedentariness and dysmetabolism. Thus, we selected subjects who were not physically active or involved in any exercise program; that is, they had a sedentary lifestyle. Moreover, before entering the study, they were carefully screened for metabolic problems which attested a dysmetabolic status, as increased levels of plasma glucose, free fatty acids, triglyceride, and urate in fasting state. Both criteria were verified by means of family doctor databases of subjects.