Did this after a very heavy lifting session. 1000m W/U. Heavy lifting (50 lb kettlebell squats, 35 lb kettlebell one arm swings, 155# sets on incline bench, dips till fatigue, box jumps - one set, one set lateral raises - 17.5#s, one set military press - 160# and one set of leg presses @ 250# and around 40 incline situps or more).