Trimming your Video
Once you've captured and saved your video it will appear in the Videos section of the app under the Swings tab. Click on the thumbnail for that video and you see the Video Details page. From this page, click on the Analyze button.
When you get to the analyze page, you'll see a Trim option.
From here, it is very simple to Trim the video to include just the swing, or part of the set up and swing that you want to save. Just slide the yellow slider on either side to trim the front and back of the video to your liking.