10 Mins WU @ Easy Pace (RPE: 3)
40 Mins @ HM-Marathon Effort (RPE: 6)
10 Mins @ Easy Pace (RPE: 3)
Find a hilly route and push the pace a little. The uphills will naturally make the RPE increase. Try to attack the downhills as well, then ease off a touch on the flat. This is a session though so effort should be quite high during the 40 mins on.