And aerobic does n't men all easy running ( e.g. the run at a higher aerobic zone ) .
The gains you will get from that will hammer down your 5k PB over time and will do it with les risk .
Aerobic does n't men all easy running ( e.g. the run at a higher aerobic zone ) .
The gains you will get from that will hammer down your 5k PB over time and will do it with les risk .