To diagnose a problem with the port, try using a different battery and cord for a while. Damaged Power Cord. The power cord is a wire inside a plastic sheath, and the wire can break with or without damage to the sheath. If the power goes on and off as the cord is moved or bent, the wire is likely broken.
You can work out if you're sore. Don't exercise the same muscle groups that are hurting. Do legs one day and exercise your upper body the next. By doing so, you'll still be able to get exercise and allow your lower body to recover and rebuild.
Performing a brief cool-down after a workout helps contracting muscles milk out excess soreness-generating fluids. In the same way, techniques such as massage and a foam roller can not only help to move inflammatory fluids out of the muscle, but also can remove adhesions and sore or tight spots from the worked muscles. If possible, use a foam roller once a week (or after every strenuous workout) and schedule a massage once a month.