Doing intervals have become second nature to me. I did some steady state intervals for an hour, and felt pretty good afterwards. My power meter is still out of commission, but I can solidly rely on my heart rate monitor to tell me to push harder or back off. The most important thing for me to get through these is to have a great soundtrack to listen to, usually something high tempo and not too aggressive. DJ sets are perfect, especially if I haven't heard the mix yet. There's usually a surprising turn here and there to keep me focused and happy while I sit and stare out the window. I look forward to sharing more of my workout music.