I am 6'2 and 250ish, gained a little weight and got lazy and started slacking on my walking exercise. This Sunday there is a charity 5k in town I want to compete in, would the best way for me to try and build some stamina would just be to walk 3 miles every day until Sunday? I know I am not going to do great I just don't want to get lapped by MILFs with strollers ideally. Did a charity 5k earlier in the spring when I was 220 and I was able to keep up with some qt milfs in their 40s and 50s