Spark looks at how many calories you said you'd burn this week, and uses that to calculate your intake range. The range suggested already includes the exercise for the week.
If you work out every second day, for example, you might find it more satisfying to ensure you use the high end of your range on workout days and the lower end on non workout days. But it's not essential to do that.
As long as you're not burning more per week than your goal, it doesn't matter if you exercised "today" or not, the range is fine every day, on average.
(If you are burning more than your goal update your goal to be more realistic - it's fine to do more exercise, just make sure it's planned for!)