your brain on nature
Spoiler: It's awesome.
Because of my ego I feared failure. I was too embarrassed to be "bad" at anything, and though I used the excuse that I was scared of hurting my back, I was also really scared of hurting my ego. So often, rather than trying something new, I did nothing at all.
Within the past four decades, the science has flourished with evidence showing exercise is good for you -- especially in the prevention of diabetes, obesity, cancer, cardiovascular disease, depression and osteoporosis.