Non-fatiguing tests like body composition scans are best performed as the first activity after at least 48 hours of rest.

“The non-fatiguing tests, you can do whenever. So this is the body composition scan, the FFMI, the body fat composition. All this stuff can be done whenever. I generally like to do that, though, as your very first activity. The reason is we know that acute exercise can heavily influence things like body composition measurements because of inflammation, water storage, et cetera. So it's easiest to just get that off of a 48 hour rest. You want to make sure you don't do any hard exercise the day before a body composition test and probably 48 hours before that.”