Good to know
When holding the SPARROWBAG®, get hold of the textile material, but also some sand inside it. The back should be kept correctly. When initiating a movement, the back is slightly bent, and lifting is started from the buttocks and the legs, to avoid overstressing the spine. When lowering the bag, do not throw it down, to avoid injuries of the SPARROWBAG®.
For children: Hold is different for the children. Symmetric hold relieves stress from forearms and shoulders. (See small pictures)
For trainers
Motor muscles
ankle (upward/plantarflexion) m.gastrocnemius, m.soleus, knee (upward/extension) m.quadriceps femoris, hip (up/extension) m.gluteus maximus, knee flexors, elbow (up/flexion) m.biceps brachii, m.brachialis, m.brachioradialis, shoulder (up/flexion, abduction), m.deltoideus front and middle part, m.supraspinatsus, m.pectoralis major (part: clavicularis), scapula (up/down rotation) m.serratus anterior
Stabilizers
m.erector spinae és a m.quadratus lumborum are the basic dynamic stabilizers of the lumbar region vertebral column in straight position, (m.trapezius lower and middle part, m.levator scapulae, mm.rhomboidei, m.serratus anterior) upper limbs (rotator sheath, m.deltoideus, upper limbs muscles) torso (abdominal muscles) hips (gluteal muscles, external hip muscles, adductor group) lower limbs (m.quadriceps- and rectus femoris, knee flexors) lower part of lower limbs (ankle stabilizers, m.tibialis anterior, m.gastrocnemius)