The best type of interval training, according to me!

My wife, who is a tennis coach, has a running track session for her students once or twice a week. I joined her session a few days ago. These days I’m so arrogant about my running that I never run with anyone because usually it’s outside of my running routine. I wouldn’t even do a mile trial against one of my four kids or my wife’s students. Because why would I, if it doesn’t help me run future marathons faster?

But I made an exception last week. I usually do intervals on Tuesdays and a tempo run on Thursdays. These are my two hard…