I have been running for two years now but still from time to time, I feel even a 5k is a battle. Breathing is good and I have my own pace but sometimes my legs just feel tired or even my calves get uncomfortable when I run. I run four times a week nowadays, 3 x 5 and a long run and even my short runs have been a battle. Knees are great and I recover well but on Saturday, I was attempting a 10k long run and by 3k I had had enough. So I did a recovery walk and then ran again. I just kept doing that with a ratio of 2:1 running walking. I noticed I was enjoying the run segments so much more and I was even springting which felt good. I knew I had a recovery time coming soon. Afterwards, my legs feel amazing. Do you think maybe I should do this regularly? Could it build up my fitness and confidence??