Sitting on the floor, with one leg bended and the other one completely straigthened.
Bend your chest to grab the foot of the straigthened leg.
Sitting on the floor with one leg completely stretched out. Bend the other one inside until the sole of the foot touches the thigh of the stretched out leg.
Push your chest forwards without bending your back and grab the foot of the stretched out leg.
Sitting on the floor. One leg bended, sitting the foot on the knee of the other leg. The other leg is stretched out.
Throw a towel around th foot of the straigthened leg.
Lying on your back. Lift one leg straight up and throw a towel around the foot. Maintain the leg completely stretched and pull the toes down, stretching the foot.
Standing up with your forearms against a wall. One leg straightened and the other one leaning forwards.
Maintain your head, chest, pelvis and leg stretched in one straight line.
Standing up, cross one leg behind the other.
Hands in your neck.
Sitting on the floor, with both legs stretched out. Put a towel around both feet.
Pull the towel towards your body. 
Standing up with your forearms against a wall. Both legs straightened with your feet at shoulder height and turned inside.
Push your body forewards, bending your arms and contract the quadriceps of the straightened legs.
Standing up with your legs straigthened.
Bend your chest and try to touch your feet with your hands.