There are many many muscles invovled in eating. The muscles of mastication (Temploralis, Masseter, Medial Pterygoid and Lateral Pterygoid, one of each on each side) are used to move the Mandible (jaw...
Ideally your whole body will be used while doing jumping. But the primary muscles involved will be your leg muscles (quadriceps, hamstrings, calves) and the muscles of your lower back, abdominal and...