The next time you see Liz, they might be wearing black instead of red. They've completed 50 good deeds with GoodGym and have earnt their black t-shirt. Give them a nod when you next see them.
Liz has visited an isolated older person during their run 10 times now. It sounds like they've made friends. This is likely to have made a huge difference to the life of the older person. Isolation and loneliness are crippling for many; a friendly face visiting regularly can change someone's whole outlook on life.