Harvard Law School student Elle Woods has some wise words in Legally Blonde when she reasoned to the court, "Exercise gives you endorphins. Endorphins make you happy. Happy people just don't shoot their husbands." Case closed, your honor!

What is it about exercise that so powerfully impacts our mood? The researchers at Happify are sharing the data on why hitting the pavement can send our mood soaring, the best time of day to exercise, and tips on how to stay motivated when we dontwannaaaa work out.

We've got the science. Now you're got to go work out.