The more thinking you do about going swimming, for a walk or working out, the less likely you are to go for a swim, walk or work-out.
That is usually my experience, anyway.
If I sit around and think about it, I can usually think myself out of whatever exercise I have chosen to do. Recycled excuses have included: "Oh, I'll go later." "It'll be busy now." "I'm tired."
If I get ready and just go and do whatever I've decided to do, I'm far better off.
Of course, I feel better after doing the exercise, rather than thinking about doing the exercise!