Gross motor skills are the abilities required in order to control the large muscles of the body, including the arms, legs, and torso (trunk). These skills are needed to maintain balance and coordination, and make activities such as sitting, crawling, and walking possible. Children who lack gross motor skills may sometimes have low muscle tone. Repeated exercises that strengthen the muscles and improve fitness can help children with gross motor movements such as running, skipping, and jumping. Balance boards, ride-on toys, push toys and walkers, pull toys, many outdoor toys, exercise trampolines, stomp rockets, pogo sticks, and classic toys like jump ropes and hula hoops can all help improve gross motor skills.