(Well I joined an athletics club).
Groucho Marx said "I wouldn't want to belong to any club that would have me as a member", however, I went out for a run with the local athletics club and was made really welcome.
They did a 5k run and cheered me over the line when I finished. Managed a PB (just over 28 mins) and wasn't last, so was well chuffed.
They have training events most days and a real mix of ages and abilities. Hoping this will help to take me forward now that Laura has got me to this stage.