RichMotion by Chad Richman on Instagram: "5 minute AB challenge! I use the simple interval timer app to set my working set times + rest period. It’ll beep right over your music so you don’t have to worry about tracking time externally. You can use Parallettes or Y-bells like I did: 1️⃣Iso L sit (30 sec) 2️⃣L sit flutter kicks (30 sec) 3️⃣L sit wipers (30 sec) 4️⃣L sit single leg knee tucks (30 sec) 2 min action, 1 min rest, repeat  - 5 mins that will cut you up "