This is the ultimate app for 4 way enthusiasts at any level, brought to you by SDC Rhythm XP. Sign up now to get access to tons of content, including articles, flash cards, continuity plans, pictures and over 160 videos. Download videos to your phone for review offline at the dropzone. Pause, adjust speed, and move frame by frame with the advanced video player. Use the filter and search bar to see just the content you want. An annual subscription gives you unlimited access to Rhythm’s constantl