My knees seem to be mending. I tried w1r1 again and managed about half of it, still a bit sore but possible. Tried to run on grass, round and round our retreat house garden. More like very fast walking only felt like jogging by the end. I did do the whole session, but walking for longer in between the runs, then iced when I got in. I hope it will get easier!! I' ll try again midweek.