I think it might be a bicep and a tricep
People often use stomach exercises to trim the stomach area of fat and to tighten up the muscles. Popular exercises include sit ups and press ups. These do work but can be tiring if someone is not used to exercise.
Biceps and Lats primarily, along with a lot of support from the forearm and shoulder muscles.
Sit-ups help work out your abdominal muscles.
press b or the other letters
The fixator is one of many muscles used during situps. The fixator muscle stabilizes one part of your body when you move another part.
press twice the switch Numbers/Letters then press twice the circled arrow how to use diad
At age 17-20 is a perfect age to start building muscles. When it comes to the chest you can do regular push ups, close push ups and use weight-lifting machines in the gym.
You can stretch out your muscles, build muscles by doing sit ups, crunches, push ups, etc. I myself use one in morning and at night to do my crunches. The lift off the ground puts more stretch to your muscles so it benefits using one.
Deltoids, and trapizius, or shoulders and traps!
You do sit ups, use the treadmill, lift wieghts, bench press wieghts, and lots more!
The primary muscles are the latissimus dorsi and the biceps brachii. Secondary muscles are the trapezius, brachioradialis, deltoid, teres major, rhomboid, rectus abdominus and obliques.
The best exercise machines to use would be a bike, bench press, elliptical or squat station. These all work on very important muscles and provide great workouts when you use them correctly.