The second training, dumbbell roll. Many people practice dumbbell side pull-ups to train our oblique abdominal muscles, but this action is unreasonable. Our lumbar spine can't support our body to bear such excessive bending. Holding dumbbells when saving people will only increase the pressure on our lower back. Improving the training action is to support one side with a flat plate, which can stimulate our lower abdominal muscles well.
The third training, upper body hanging roll. Hanging in the upper abdomen will overstretch our spine and put a lot of shear stress on our spine. Improving the training action is to roll your belly. We just need to raise our hands above our heads during training, and we can exercise our abdominal muscles well.
The fourth training, supine leg lifts. Many of us don't let our lower back touch the ground, and we don't control the rhythm when our legs are lowered, which will cause great pressure on the lumbar spine. Improving the training action is to lie on your back and lift your legs. When we train, keep our lower back close to the ground.
The fifth training, Russian twist. If we only do the Russian twist, then our abdominal muscles are not well stimulated at all. Improving the training action is to rotate the abdominal muscles, keep our hands still and let our hands move with our shoulders.
The sixth training, pedaling the wheel. If we only shake our elbows when pedaling the wheels, then this training is meaningless. In order to improve the training movement, the bicycle rolls its abdomen. When we do exercise, we keep our elbows still. Then we rotate our bodies to drive our elbows so that they touch our knees.