7 x 600 meters on the track last night. Splits were around 2:20 for 600 m (1:34/lap). First I tried it with 200 m jog for recovery, but after the third set I felt too tired so I decided to increase recovery time to 1:50-2:00 (basically power walking the 200 meters instead of jog). That way, I could finish strong and paces didn't fall off.