Fitting in some simple movement and bodyweight training when you can is a lot more effective than waiting for your schedule to clear up enough to commit to the perfect 5-day-a-week training plan.
Similarly, following a paleo diet with a few exceptions here and there is a lot better than eating pizza every night until your next round of Whole30 starts again.
Don’t wait for things to be perfect to get started. Simply choose something good.
A string of good days is a lot more effective than the perfect day that never happens.