If you don't have a partner, take a small partner or girlfriend to exercise together, so you can also supervise the training together to prevent yourself from being lazy. Two people are always lazier than one.

Training action

One person does elbow support, and the other person also does elbow support in the direction perpendicular to her, then alternately stretches out his arm twice under the other person's abdomen, and then alternately stretches out his arm twice above the other person's back.

Training action

Two people bend their knees and lie on their backs face to face, cross their legs, and then do sit-ups at the same time. After getting up, they high-five each other.