I have recorded reams of data from paddling: * heart rate(0.2 Hz) * GPS position (1Hz) * acceleration(100Hz) Everything is keyed on time, using the "Time::HiRes":http://search.cpan.org/dist/Time-HiRes/ perl module. Now I just need to test a few hypothesis: * speed is related to peak acceleration * speed is related to stroke rate I do not really believe that paddling is that simple, but I'm looking for some well defined problems to brush up on my skills with "R":http://www.r-project.org/