These are Matt’s heros, Parkour. I am sure most of you have seen this style of stunts at least once in the James Bond film with Daniel Craig, Casino Royale. Like them he takes all necessary precautions before performing any of these stunts, they are dangerous, he does get hurt from time to time, so, DO NOT TRY ON YOUR OWN!
For more fun watching this is his current favorite video of Parkour acrobatics.