Running intervals 50:07 9.42 km (5:19 / km) +27m 5:15 / km
ahr:141 max:184 shoes: ASICS Gel-Cumulus 16 (yellow)
Some speed training on a 250m track.
1000-500-250-500-250-500-250-1000
Break 2min or heart rate below 120 (the latter one always happened earlier)