Up until recently one of my 'key' weekly sessions was 5 x 2-minute intervals with 2-minute recoveries between (I'd just started speedwork). I've now moved to a much hillier area and none of my training routes are flat or even have substantial sections which are flat.
Over the past few weeks I've been adjusting to running on hills and still do my long slow run, recovery run and tempo run on various routes from my home, all of which are quite hilly. However, I don't want to lose my speedwork, but everything I've read in RW and elsewhere states that speed sessions should be done on a smooth, flat, measured surface. What to do?