I feel your pain.
In my case it wasn't depression so much as anxiety. After a couple of serious bike accidents I had a terrible time just "climbing back onto the horse". On more than one occasion Mrs. Grouch and I drove down to the Katy Trail, assembled our recumbent tandem to ride - then disassembled it and loaded everything back into the car because I couldn't bear the thought of riding. Therapy with a psychologist didn't seem to help. Gradually, my anxiety would start to fade only to have another setback.
That's been for about 4 years. I'm hoping this year will be a breakthrough for me. My cinfidence is definitely building so that's a good sign. We'll see.
The body is stronger than the mind - at least in my case.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.