We’re the same age, and I found Ageless Athlete very useful. It is not a standalone program or book, but a compliment to TB1 and TB2 and assumes you have these. It gives some ideas, tweaks, philosophy, and motivation to run and plan TB programs. If you’re interested, my results on the program are posted on my Training Log. The “before” pic is in the first post, and my recent progress from last week is in post 262. (I haven’t run TB Mass, but TB1, 2, using guidance from Ageless Athlete).
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