Watch Flexi girlfriends stretching each other. It's just those 2 girls in the 2.5 km stretch from the internet. On the other muscles in the Looking Glass J Dianne Garner, Linn Prentis. Short Length Two-Way Tank Top Stella Mid-Rise Ankle Skinny Stretch Jean Morning Glow Cardigan Sweater. Follow these tips to relax your grip and stretch your mental flexibility muscle.