Monday was my leg day, and after testing the out limits of my quadriceps weight bearing abilities, the last thing I wanted to do was to get on the stair stepper or treadmill and run. So I experimented with the incline and speed on the treadmill. I took my baseline heart both with a stop watch and the machine and it correlated well at around 68 beats per minutes (bpm). Then I started off at 3 degrees incline and at 2.5 miles per hour (mph) on the treadmill. With each change in the variables, I correlated the machine readout of my heart rate with my stopwatch, and they were actually quite comparable. I increased my incline sequentially by a few degrees, and increased my walking rate to 3 mph. at 15 degrees incline and 3 mph, my heart rate was persistently in the 130+ range. At 10 degrees, it was in the 120 range. So I varied the incline every 2-3 minutes, and kept the speed at a comfortable constant 3 mph for 40 minutes. At the end, my legs did not hurt, and I had a good cardio workout. It also did not seem as onerous as pushing myself hard on the treadmill or stair stepper for 30 minutes, and I achieved the same calculated calorie goal. For those who say that they don’t have 40 minutes to do this type of experiment, you can split it up into 2 20 minute sessions, one in the morning and the second at night. In fact, there is research that suggests splitting up cardio into 2 shorter sessions rather than 1 long session boosts your metabolic rate higher than just one session.