I felt the urls for the posts here were too long so I changed /activities to /blog and this created an increase in 404 pages.
I found an used this help page for URL redirects and entered this for the redirects:
/activities/[name] -> /blog/[name] 301
Initially I rushed and left out the name parameter. I noticed that the redirects for the specific posts were not working. It is covered in the original documentation but I had to do it, break it, search again and find a different, similar page to get me to re-read the original documentation.
I used a 301 instead of a 302 because this is a permanent change.
These should now get you to the space post:
https://johntrack.com/activities/2020/12/15/302-redirect-activities-to-blog
https://johntrack.com/blog/2012/12/15/302-redirect-activities-to-blog