Training- 3 Aug (Half Interval Half Tempo)

Thought of doing some speedwork at Bedok Reservoir this evening.
Planned to do 5 x 1km interval, but unfortunately the battery on my garmin went flat after 1st lap i couldnt record my timing and HR.

Did my lap at 4:22 but already half-dead at the end, is the out-of-breath kind of half-dead.
Tsk tsk tsk....am I getting weaker physically or mentally.

For the next 3 x 1km, I was just trying to speed up a bit but I didnt know my pace. My guess is about 5:30-5:45, so it was more tempo run than speed run.

Total distance: 8.6km
Total time: unknown
Avg pace: Unknown
Avg HR: Unknown

^..^ ^..^