Me: Bought a cadence computer specifically to keep an eye on it. It has made a difference to my overall stamina and discourages me from wrecking my knees. Keeping a higher cadence seems to eek out my stength more. The downside is I'm slower to build power but that's fine because the other main purpose is not to overdo it as I ride. So cadence and HR are my weapons for this. Being something of a stop and go cyclist about to make another return to it in a few weeks, I've found it all very useful and it compliments the turbo. Oh and 89 to 90 is my rpm down to 50 on hills and 40 ish on "Oh Jeezus, I'm not going to make this" inclines.