I got the worst respiratory illness of my life the last week of December. I didn't feel well enough to lift again until a few days ago. Today was the first day I've felt well enough to try doing cardio. I did a tabata on my indoor bike keeping the hard sets above 22 mph. Tonight I'll be commuting to and from work on my bike. Hopefully I've recovered enough for my body to handle the cardio. I'll soon find out, I'll let you guys know how it goes.