Jason Pak & Lauren Pak on Instagram: "Core training in less than 18 seconds! Create mobility, create motion, and resist motion is a general strategy we like to use when it comes to improving core strength in a comprehensive way. For the core, we like to heavily emphasize rotation, extension, and flexion. For sets and reps we like 1-2 sets of 8-12 for creating mobility, 3-4 sets of 8-12 for creating motion, and 2-3 sets of 6-10 reps for resisting motion - but those are just loose guidelines! . .