a goalkeeper need good speed reaction, therefore beside a static streach, a much more active, dynamic aproach to flexibility called mobilisation exercises is required.
Goalkeepers do require jumping flexibility along with upper body stretch in addition to static active flexibility, static passive flexibility and dynamic flexibility
..., propioception training, joint mobilization, ballistic training (eks.), dynamic max flex., perception in time and place (in corner angles), speed reaction, exercises with elastic bands, exercise with closed eyes, lying on the floor and reacting with legs and hands, exercises with weight (0.5-1 kg) in the hand and foot, fast steps in place with legs, hends, repetition training for speed and reaction....