At the start of the 1930s the Soviet Union was the worlds largest aircraft producer by far. And as war clouds gathered during the late 1930s, the countrys production grew rapidly: Soviet production quadrupled from 2,529 in 1935 to 10,382 in 1939.
Gym Machines & Equipment. Most gyms have machines or equipment that will target the abdominals specifically. The seated abdominal crunch and captain's chair are two such machines that tone the rectus abdominis and lower abs respectively. Ask a fitness trainer to show you how to properly use machines to avoid improper technique and injury risk.
If your goal is to build muscle, aim for 8 to 12 reps per set. However, there are a few exceptions to this rule. When training your lower body, aim for 12-15 reps per set. The same goes for your abs. Whether you want size or strength, perform 3 to 5 sets. Rest for 60 to 90 minutes between sets.