R,
I was going to start a thread on this, as it consumes me. I spin 4X a week, and work a step mill with a back pack the other three.
Spinning, which is a 55 minute burn, I average about 155-163 beats per minute, which is about 85% of my target (max) rate of 186.
Plain and simple, this shit will change your life. I know that some people say that that lower zone is good too, but given your age and general level of fitness, my spinning guru (hot mid-40's MILF) said to add at least 10 beats to my "target rate" to compute my numbers. Therefore, your 75% rate will be much less tolerable, and more productive - it should not be comfortable.
My friends think I need a support group for my addiction to this shit, but, hey, you no I live in flat humid hell here in StL!
Hope that stuff is some help.
"When restraint and courtesy are added to strength, the latter becomes irresistible."
Mohandas Gandhi
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