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The correct answer is "perut" because Sit Up is a popular exercise that specifically targets the abdominal muscles. By performing Sit Ups, individuals can strengthen their core muscles, including the rectus abdominis, obliques, and transverse abdominis. This exercise involves lying on the back, bending the knees, and lifting the upper body towards the knees, engaging the abdominal muscles. Therefore, Sit Ups are primarily used to train and strengthen the muscles in the abdomen, leading to improved core stability and overall physical fitness.

Push Up adalah gerakan yang digunakan untuk melatih kekuatan dan kekuatan otot lengan. Gerakan ini melibatkan penggunaan otot trisep, bicep, deltoid, dan otot-otot stabilisator di lengan. Selama push up, berat tubuh didorong ke atas dengan menggunakan kekuatan lengan, sehingga membantu memperkuat dan membentuk otot-otot lengan.

The correct answer is "tangan". During a push-up, the weight of the body is supported by both the feet and the hands. The hands provide stability and act as a base of support, allowing the individual to push their body up and down. The knees are not involved in supporting the body weight during a push-up.

To increase muscle strength, it is necessary to train them at a frequency of 3 times per week. Training at this frequency allows for enough rest and recovery between sessions, while still providing enough stimulus to promote muscle growth and adaptation. Training too frequently may lead to overtraining and hinder progress, while training too infrequently may not provide enough stimulus for muscle growth. Therefore, training 3 times per week strikes a balance between training volume and recovery, optimizing muscle strength gains.

To improve lung and heart fitness, it is recommended to exercise 3-5 times per week. This frequency allows for regular cardiovascular workouts, which can help strengthen the heart and improve lung capacity. Consistency is key when it comes to improving fitness, and exercising at least 3-5 times per week ensures that the body is consistently being challenged and making progress.

The correct answer is kekuatan otot lengan, dada dan bahu. This is because push-ups are a compound exercise that targets multiple muscle groups, including the arms, chest, and shoulders. By consistently performing push-ups, individuals can improve their overall upper body strength in these areas.

The correct answer is "mengangkat bahu dari lantai". This is because the term "gerakan crunch biasa" refers to a common crunch exercise, which involves lifting the shoulders off the floor while keeping the lower back pressed against the ground. This movement targets the abdominal muscles and is often performed to strengthen and tone the core.

The correct answer is "mengangkat kedua lengan ke atas". This is the correct body movement when performing back muscle strength from a prone position. Lifting both arms up engages the muscles in the back and helps to strengthen them. Lifting the legs or head from the floor would engage different muscle groups and not target the back muscles specifically. Bending both knees is also not the correct movement for strengthening the back muscles.

The correct answer is "digunakan beban ringan, ulangan banyak". This is because when training for muscle strength, it is recommended to use lighter weights and perform a higher number of repetitions. This helps to build endurance and improve muscle tone without causing excessive muscle damage or fatigue. Using heavy weights with fewer repetitions is more suitable for muscle hypertrophy or size gains.

The correct answer is gerakan saling memutar. This is because when performing flexibility exercises with a partner, such as stretching the muscles of the legs, a rotational movement is often involved. This movement helps to increase the range of motion and flexibility in the muscles. The other options, such as gerakan saling tarik-menarik (pulling and releasing movement) and gerakan saling dorong-mendorong (pushing and pulling movement) do not accurately describe the specific movement involved in performing flexibility exercises with a partner.