We aren’t suggesting that you spend all of your time immersed in just-manageable challenges. Doing so is probably not very practical. Plus, you still need to recover in between bouts of stress for the effort to be beneficial. What we are suggesting, however, is that for the capabilities you wish to grow—whether they be financial modeling, portrait painting, distance running, or anything in between—you should regularly seek out just-manageable challenges: activities that take you out of your comfort zone and force you to push at the point of resistance for growth.
