I am 71 years old. : I have run 16 marathons over the last 13 years, including 5 Marathon Majors. I have a place in the Tokyo marathon 2024. Having had both hips replaced 2 years ago. I first attempted to use the 9 mile marathon training when I was allowed to run post the 2nd operation, but my heart rate was too high every time I tried to run at my MHR and could only walk and I thought it was no good for me. Now I wonder if I was trying too soon after the operations and would like to give the 9 mile marathon training another go. 🤞