I did do one long run (7k) earlier this week, but think I'm going to stick to shorter ones for a bit, because with 5x50 I have trouble finding the energy for the longer ones, but I don't want to stop running.
So, I did a one mile run along the flat road from my house to the edge of the village and back. Took me 12 minutes, which is a good pace for me. I think I'll redo that run and try to get it a bit faster - or maybe go a bit longer at the same pace - rather than going for long runs for a while.
When I got back I did a 30-minute yoga session, and was a bit more energetic with the yoga than usual, so I feel I've done a good effort for today, even though my running only covered about 1.5k running. I'm really glad I've started yoga again, after about a 25 year break - it really does reach many parts of the body! So there's another positive for the 5x50 challenge.