Your training program is the most common abdominal muscle. Let's talk about why you practice like this first. Abdominal contraction is mainly the upper part of abdominal muscles, and supine leg lifting is mainly the lower abdomen. Because rectus abdominis belongs to smooth muscle rather than skeletal muscle, it covers a long distance on the stomach, so it is difficult to practice total abdominal muscles in most exercises. So many people use this training method of combining upper abdomen and lower abdomen. In this group, no rest means that after practicing a group of abdominal rolls 15-30 times, you can immediately practice supine leg lifts without rest, and then do abdominal rolls after finishing, so that 4-5 cycles are generally the best for cycle training. Although there is no rest in the middle, in fact, the lower abdomen has rested when practicing the upper abdomen, and the upper abdomen has also rested when practicing the lower abdomen. In this way, the abdominal muscles are always excited during the whole training process, which can have better results. But if you just start practicing, it's better to take a break for a few seconds, mainly because you can do 15 times or more for each movement.