Justin Credible

“  If your expectations are always those of someone content to live without physical challenge, then when it comes time for mental, moral, or emotional challenge you fail to meet it because you are out of practice. Meeting and overcoming obstacles are skills that can be honed, as opposed to talents with which we are born. The best way to prepare for the inevitable shit that life occasionally hands us all is to live in a way that prepares you for it. If you can treat personal tragedy like a heavy set of 20 squats, you'll do better than someone who has never met any challenge. Intentionally placing yourself in the position of having to complete a task when you don't know if you can is the single best way of preparing to be in that position unintentionally.”
― Mark Rippetoe, Strong Enough? Thoughts from Thirty Years of Barbell Training

“Humans are built to move. We evolved under conditions that required daily intense physical activity, and even among individuals with lower physical potential, that hard-earned genotype is still ours today. The modern sedentary lifestyle leads to the inactivation of the genes related to physical performance, attributes that were once critical for survival and which are still critical for the correct, healthy expression of the genotype. The genes are still there, they just aren't doing anything because the body is not stressed enough to cause a physiological adaptation requiring their activation. The sedentary person's heart, lungs, muscles, bones, nerves and brain all operate far below the level at which they evolved to function, and at which they still function best.”
― Mark Rippetoe, Practical Programming for Strength Training

“There is simply no other exercise, and certainly no machine, that produces the level of central nervous system activity, improved balance and coordination, skeletal loading and bone density enhancement, muscular stimulation and growth, connective tissue stress and strength, psychological demand and toughness, and overall systemic conditioning than the correctly performed full squat.”
― Mark Rippetoe, Starting Strength

“Humans are not physically normal in the absence of hard physical effort.”
― Mark Rippetoe, Starting Strength