Nice evening run - old upper thomson 12.5k

Did the Bishan Park to Old Upper Thomson Rd out and back 12.5k route in 55:19.  Set a new personal best and still had quite a bit left in the tank. 8/10 in terms of intensity.  Planned to run fast but was still surprised by the results.  Cool weather might have had something to do with it.  Could also be due to well rested legs (no runs for last 3 days due to cough).  Cough still lingering though.