You Still Got It, Girl! Fast Twitch Intervals Looking for technical help? Contact Support Looking for community support? Visit the Flipping50 Facebook Group Here’s your Cheatsheet! Video I 30-second 30:30 second Recovery Video II 1 min: 1 min Core Video III 30-second 1:00 Booty Video IV 30-second 1:30 Strength ShareTweetSharePin