I have recently switched from 3 runs (5,5,10k) to 4 runs (4 x 5k) each week which has been very good because I get more days with a run in it, therefore more fun. Legs are fine and I have a nice easy pace so happy with that. I did my 3 x 5k runs in the week and I have been missing a "long run" day, so went out today a bit disappointed it was going to be a 5. However, I wasn't feeling too energetic, so by 3 I was relieved I wasn't doing a long one. I thought to myself I could get to 5 and see how I feel, when I got to 5, felt ok, nice plod so thought "why not go to 6?" So I did, and then just felt 10 is a better number, so I kept going! Do you ever use mind tricks to go further, it works every time with me?
Pretty happy because this week I have done a 10 and 3 x 5 which is 25 Kms, so four runs is not only more fun but it also allowed me to up my distance. Pretty happy with that and planning the same again next week!