I’ve never been very scientific about it. I try to ride daily, and when my legs feel like wood, I spend less time checking my average speed. I have nothing but climbs from my home so I get something. If it gets late in a day that’s gotten away from me, it becomes a rest day. It happens a couple of days a week. It’s just so good to be out on the road getting salty.
I’d call today a rest day though I rode. Wife wanted to ride so we did a heritage rail/trail near York, PA. Surprisingly lovely. I hung with her for a third of the ride then pumped my gravel grinder and caught up later. It was good to turn legs though not a fan of sustained flat.
i think if I really pushed it, and that’s pretty relative at 68, I’d do rests.
stay upright,
j