Match the terms with the correct explanations. 1. when the joints move more easily a. improved range of motion 2. results in fewer varicose veins b. shoulder flexibility test 3. comes from equally worked antagonistic muscles c. lactic acid 4. when the muscles and joints are more flexible d. muscle fibers 5. lowers blood pressure and blood sugar e. decreased joint stiffness 6. measures back and leg flexibility f. improved the ability to relax 7. slide together to shorten a muscle g. improved posture 8. a by-product of exercise h. myofibrils 9. performed by trying to grab your hands behind your back i. flexibility exercises 10. the muscle cells j. improved circulation 11. the front and back muscles of your leg k. standard sit-and-reach test 12. reduces the chance of muscle injury l. antagonistic muscles