Get a flat belly demo with 12 second JACKNIFE move
Jorge demonstrates the jacknife move from 12-Second Sequence
Don't exercise more, exercise smarter! Jorge Cruise's 12-Second Sequence promotes a fitness plan for time-crunched people. In this video he demonstrates the jacknife move to help flatten your belly and get sculpted abs. All you need is a balance ball.
Read our review of The 12-Second Sequence.