nah, given the nature of the XML schema for bike rides, you could pretty easily do this. break the tags onto columns, one row per trackpoint, a simple if statement referencing the elevation and distance of the prior and current row gives you the grade between those two points. then another statement discarding that point if the grade is less than some selected percentage. weight the remaining grades by the distance they represent, and there you go. you could make a histogram or averages or whatever you want.