Oh yes. That is true.
Initially when I contracted COVID, I knew it was going to be difficult to recover from. I totally under estimated its effects on me.
It left me with old muscles that needed to be built back up. Walking and doing my photography back and forth on a boardwalk has helped.
I see on tv that being too sedentary is the 'kiss of death' for us ultra experienced people ( I refuse to say old ). I am seeing that this is true. So look out backyard, I am walking more this summer and I am going to chase those Sandhill Cranes up and down the boardwalk at the Kensington Marsh!!!