What makes an impact? 5%. I am currently listening to the David Goggins audio book Can't Hurt Me, where he talks about the different 5% makes in one's progress This can be applied to training of course, as in increasing a weight load or duration of 5%. But it can also be applied in other areas of life. Examples could be giving yourself 5% more sleep time, saving 5% more, spending 5% of your month visiting with your friends and family. 5% might not seem like a big deal, but it