Only good part is the mountain biking. The trampolining is boring and very poorly framed and GoPros are no match to fluorescent bulbs indoors. The last shot of skiing is random. The two opening shots are blah, and the large black block makes it feel disjointed. I know you wanted to emphasize the "drop" of the beat with the sudden cut of the trampolining but there are more effective ways of achieving this.
On the mountain biking part:
-look at colour correction. There are tons of tutorials on this so look that up.
-Each shot goes on for way too long. When the rider isn't close to the camera or doing something interesting the viewer is bored. For example after the rider does the small step up jump he just rolls slowly away for like 5 seconds. Just cut that shizz, it will make the whole video flow better.