Friday almost Speed work

Wasnt sure what to do today, so i decided on 3x15 min at marathonish pace, with 3 min walk recovery. Headed down to tunks park for my warm up and some stretches. Then headed off up and down the approx 1km path. I did try to push the pace, but did struggle somewhat. My ankle did give me a little grief and it was bloody hot. The breathing was quite good, but the pace was probably slightly off marathon pace. These midday sessions are getting harder and harded. Around 18km for the session.