Gilly Green Pilates - Below double leg stretch - we've been doing these in the intermediate/ advanced classes (5-10 times) - "go out on the exhale and wrap your abs flat" See
7 Steps to Plyometric Program Design - ppt video online download
Expert Answers: Non-Running Exercises to Increase Your Speed
5 X Double leg bound - YouTube
Two Timer Double Leg And Arm Restraints,keeps Arms And Legs Bound Together,connect Knees To Elbow - Teddies & Bodysuits - AliExpress