According to what you said, it seems that you have just started exercising and are exercising every day. If so, it's actually that your body hasn't adapted to your exercise intensity, and some muscle groups need to rest for a day or two to continue practicing, so as to give the muscles the necessary time to recover and become stronger.

People who have just started fitness or exercise need a gradual process. You can change it to once every two days first. After a week or two, gradually reduce the interval days and increase the intensity. I do aerobic exercise every day, and sometimes I am very tired, so I will take a day off and go to exercise the next day, and I will feel very energetic. Remember an old saying: haste makes waste.