Run blowup Macritchie

Yesterday i ran 2.4km at sembawang canal with henry at comfortable pace in my super wet shoes washed by my dear wife, and we chat, and make an appointment with Michael today for a tough run at macritchie trail. Brought the lousy Anta chinese made running shoes, as i left the NB stability shoe at home, run began after zig zag bridge after few minutes of warm up. It was quite surprised to see michael strong in early metres. Relatively flat stage seem ok, and then the slopes began, up, down, up, down, up, and down , and started to feel the strain, while trying to talk. After the 6th or 7th slopes, i seem to lose the breathe. Last 2nd slopes before the t-junction, which is 2.4km, i seem to have blown. I told michael to go ahead, looking at the watch , estimate to be around 18-20 min , as last 2 slopes i was practically at walking pace , sweating profusely. Michael waited at the end of t -junction and along the boardwalk, tried to walk a bit, and run a bit, but seem legs are no more. we completed the whole route 4.8km, but seem lay par. Good workout, but i need more workout on the slopes, and i will come back. Exhaustion and waiting for verdict tomorrow if my legs are going to be sored by the strain today.