How to improve your sit and reach distance

We have managed to find a website that suggests an extensive stretching workout to looosen your muscles and therefore ensure a higher score for sit and reach. Remember, the website states that we are recommended to hold each stretch for 15 seconds or more if we have time. Of course, remember that each stretch should feel good. If not, it is highly recommended to give yourself some time to rest before continuing. The following is some content extracted from the website itself. 

Hip/Glute StretchCross left  foot over right knee.  Clasp hands behind right thigh and gently pull the leg in towards you, keeping upper body relaxed.  Switch Legs	1
Hamstring Stretch Lie on floor with knees bent.  Straighten one leg and slowly pull it towards you, clasping the thigh, calf or ankle.  Keep knee slightly bent. Switch legs.	2
Inner Thigh Stretch Sit on floor with feet pressed together.  Keeping abs in, lean forward until you feel a gentle stretch in your inner thighs.	3
Lunge Stretch In lunge position, rest back knee on the floor, with front knee at 90 degree angle, abs in.  Gently press forward until you feel a stretch in the front of the leg/hip. Switch legs.	4
Kneeling Hamstring StretchFrom above lunge position, slowly move backward until leg is slightly bent. Bend forward at the hip, keeping back flat until you feel gentle pull in the back of the leg. Switch legs.	5
Piriformis Stretch Begin on the hands and knees and bring the left knee in, resting it on the floor between your hands (you should be on the outside of the knee).  Straighten the right leg out behind you and, if you can, bend forward and rest the forearms on the floor.	6
Knees to ChestLying on the floor, pull your knees into your chest and clasp your hands under your knees.  Gently press your hips to the floor.	7
Knee to ChestFrom above position, straighten one leg and pull the other knee into your chest until you feel a stretch in your hip.  Switch legs.	8
Calf StretchOn hands and knees, straighten your legs, but keep them slightly bent.  Gently press one or both feet towards the floor, keeping back flat and abs in.	9
Kneeling Calf StretchOn hands and knees, bring the left foot in between the hands and gently press the knee forward while pressing the heel towards the floor.	10
Spine Twist Lying on the floor, place right foot on the left knee.  Using your left hand, gently pull your right knee towards the floor, twisting your spine and keeping left arm straight out, hips and shoulders on the floor.  Switch sides.	11
Quad Stretch Lie down on your side using elbow for balance.  Using other arm, slowly pull your foot towards your glutes, keeping both knees together and bent knee pointing down.  Switch legs.	12