Which track and field World Records do you think have been bested by athletes outside of competition?
Seeing the massive (but slightly foul) jumps in LJ and TJ, and from my own experience doing HJ and SP, I believe almost all of the field events have been broken in practice, just because more attempts = more chances for everything to line up perfectly, whereas in competition you only get a few chances.
I am doubtful that many running events have WRs outside of competition (maybe some hurdles?), but would like to hear what the collective mind of LR has to say.