For field events it’s usually because of the controlled conditions, as mentioned.
For track events, it’s because an indoor track is (usually) 200m, as opposed to 400m outdoor. I THINK to be an official indoor record the track needs to be 200m or less.
This smaller track size is slower (tighter turns and shorter straights), and also causes events to be run a little differently. For instance, outdoors the 400m is run in lanes the entire way.
Indoors the runners would run 2 turns, and then “break”, coming out of their lanes and letting everyone run in lanes 1-2.
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