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This exercise is performed sitting on the floor with knees bent like in a "sit-up" position with the back typically kept off the floor at an angle of 45°. In this position, the extended arms are swung from one side to another in a twisting motion with or without weight. Equipment: body weight, kettlebell, medicine ball, or dumbbell.
Some dumbbell exercises, such as dumbbell fly can be performed on a ball. [10] Ball exercises are popular among runners. [11] Most frequently, the core body muscles; the abdominal muscles and back muscles are the focus of exercise ball fitness programs. [12] Using an unstable surface recruits more muscle units without increasing the total load.
As you roll up, try not to use momentum. Instead, focus on using your muscle strength. Roll down to your starting position, vertebra by vertebra.
Fitness instructor Kathy Smith first experienced the Williams/Miller prototype step aerobics program during its early days, thinking "This is the most cutting-edge workout I’ve ever seen." [ 14 ] Miller and Williams formed a company called Bench Blast in late 1988, making wooden steps from 6 to 12 inches high. [ 11 ]
Unlike the exercises with dumbbells or barbells, kettlebell exercises involve large numbers of repetitions in the sport, and can also involve large reps in normal training. Kettlebell exercises are in their nature holistic; therefore they work several muscles simultaneously and may be repeated continuously for several minutes or with short breaks.
Abdominal exercises also put some degree of compressive force on the lumbar spine, putting unwanted stress on the lower back. In addition, exaggerated abdominal exercise can cause respiratory problems. [17] A study of twelve exercises concluded that no single exercise covered all abdominal muscles with high intensity and low compression. [18]
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