Dan + Shay & Justin Bieber – 10.000 Hours AB WORKOUT – SLOW & INTENSE This Dan + Shay & Justin Bieber – 10.000 Hours AB WORKOUT – SLOW & INTENSE is a rather slow (BUT VERY INTENSE) ab workout. I think it’s perfect if you struggle to keep up with my longer ab workouts. … Continue reading Dan + Shay & Justin Bieber – 10.000 Hours AB WORKOUT – SLOW & INTENSE