all muscle groups are used.
The eyes' muscle group is the orbicularis oculi
Swimming uses pretty much every muscle in the body (quads, hamstrings,biceps,tricepsabs...etc). the only muscle that's not really used is the calf muscle.
I find alternating between the breast stroke, the crawl and the back stroke works lots of different muscle groups, and as you are alternating between swims gives each muscle group a break/rest.
Yeah,and a lot of it! You push water,with your own body. You are in deep water,and pushing your body through the water,oh course you use muscle strength!
To help the fish to swim.
Chin-ups, just as most exercises use a primary & secondary muscle group. The primary muscle group would be the back (or latissimus dorsi). This is what helps to give that "V" - shape in the torso area. (along with slimming down the torso area, of course) The secondary muscle group would be the biceps. Depending on your grip position, you can focus either more on your "lats", or arms.
They use their legs to swim.
The first group of muscled animals were likely jawless fishes, which evolved around 500 million years ago. These early vertebrates had simple muscle structures that allowed them to swim and move efficiently in water.
muscle
The hamstring muscle group (biceps femoris, semitendonosis, semimembranosis) are the antagonists to the quadricep group.
dolphins swim in pods to protect themselves and to catch food
The scapula is not a muscle; it is a bone.