Commitment and Sticking to Goals

During my whole-body detox, I sometimes wondered if I could stick with it for the whole 21 days. I saw an article posted on Reddit about some Japanese Buddhist monks who take a vow to run incredible distances almost every day for eight years. If these guys can do it, then eating healthily and detoxing for 21 days can't be hard. Whenever I am faced with something that feels too hard to stick to, I think of the Japanese monks.