Been training for my first 5k i am on week 5 run 2 and the 2nd round of 8 minutes i had to walk a couple times for about 15 seconds. First time i had to walk outside of the plan. I guess trying to maintain a 10min pace was too much ive been able to do that on all the other runs. Feels pretty pathetic but i guess smoking on and off for 25 years didnt help. I quit before i started its been 49 days no cigs and 54 days no alcohol. I dont even know if this is good or not? I know 60 hear Olds that run marathons. I know 55 year olds that are running these 5ks at 7 min paces. Does it ever truly improve? Every workout has been hard.