It is a big mistake to train your arms every day. There is no way for your arms to grow by going after them every day, and it would help if you rested so they can recover from physical stress. Within a few hours of a workout, it is common for your muscles to lose strength and power as they begin to heal; however, within 36 to 48 hours of the training, it is common for your muscles to get stronger, also known as “supercompensation.”