This was a bit more of a challenge for me, still managed to finished it. Legs got a bit tight, loosened up after stretches, but it was my breathing that got me. I took off a bit faster than I should have on the first two runs and struggled to get a rhythm with my breathing on the first 5 min run. I took the pace down for the next 3 and 5 min and felt a lot better. Will watch my pace on the next run.