Sub 50 goal but i cant seem to achieve in my training when i do a 10 km training run

[microyan]

yeah, i am consistent in running. normally in the 2 km session i dont have much problem to maintain a 9:50 pace, but yesterday i felt exhausted even when i started the first 2 km session…i went swimming before my run, i felt alright, but as soon i started running i felt like a bit tired.

i will normally do 10 km run once a week, and focus mostly on the 5 x 1 km, 3 x 2 km and sub 25min 5km, and 30 mins easy run mainly as part of my training. i dont have much problem maintaining the pace as recommend on the sub 50 training.

However, i dont normally go for long run such as the 1Hr 45min as prescribed on your "Training towards a sub 50 minute 10K”.

ian