Sub-20 5K PR Inside a Marathon Training Run at 51

I wasn't trying. It just happened. Sub-20-minute 5K within a marathon training run. 19:55. New PR at 51 years old. 38 days until my next marathon. Let's go! 💪 Today's interval workout: - 1.5 mile warm-up - 4 × 1 mile intervals starting at mile 1.5: 6:56, 6:19, 6:19, 6:48 - 0.5 mile cooldown run - 1