Working your abs is not an easy job! Each of the abdominal muscles respond to training at a different rate, and there is another group of abdominal muscles just below those ‘6-pack’ muscles with fibers pointing in the opposite direction, which makes up your core. This is why no single exercise can attack the core and why it’s so gang hard to work them! It’s funny to think that this 5-minute plank workout requires virtually no movement! http://weightlossempire.net/
ejercicio muy buenos con pelota, sin duda vas a sentir como trabaja cada musculo de tu cuerpo.