Track session with the running club tonight. Session was a warm up, you do as much or as little as you want I did 3 laps (1.2km), this is followed by three 100m strides, you run these each gradually quicker but not at a full sprint. Then the main part was 6 x 3min with a 1min stationary rest. You basically run hard for 3 mins then rest for a min getting you breath back and trying not to Puke then repeat it five more times. Then a cool down again this is as much or little as you want, I did 1km. All up covered a bit over 7km. Legs are sore now and lungs certainly know they've worked. Good workout.