Changes

This scale is a result of many runs and races where mental toughness was the greatest challenge. Scales of perceived exertion or perceived effort can be useful, so I started to muse on what a but these do not apply well when the limiting factor is not how intensely you are exercising. This scale of is based on how much perceived suffering would look likeis experienced. I used the units of 'Ivan' after my one of my running heroes [http://en.wikipedia.org/wiki/Iv%C3%A1n_Castro Ivan Castro]]. The indications are suggested guidelinesOn a 100 mile race, and it is possible to have a workout meeting one criteria would use that level. So nearly crying would define a run as '6/10 Ivan'low perceived effort, but undergo immense suffering.