Martin,
In my youthful exuberance and indiscretion, I was a big ring grinder for many a year. I left scorch marks on the pavement, true, but now I am paying the price early at 32. Get a HR monitor and choose the gear that allows you to maintain your target zone and RPMs of 90-100 simultaneously. You can slow down if you are climbing in the seated position, and have pushed back a bit in the saddle.
If you get a stationary trainer, you can practice this and do your stock research at the same time. 
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"Whatsoever thy hand findeth to do, do it with thy might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave whither Thou goest." - Ecclesiastes 9:10
"If simple folk are free from care and fear, simple they will be, and we must be secret to keep them so." - JRRT
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