Try this HIIT workout to get your lean legs and noticeable abs. This is how I am getting my abs back into shape!
I say there are only 60 stairs here but really, there are 100.
Run up stairs in 45-60 seconds
Run down stairs in 30 seconds
Rest 30-45 seconds
Takes 2 minutes each time for a full flight up and down. I do that for 20 minutes or my goal is 10 each time I go!