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.
Experts used to recommend stretching before a workout to prevent sore muscles. But research shows that stretching ahead of time doesn't do much to prevent soreness or injury. Frese says it's better to get in a good warm-up before you exercise. Stretch later, when your muscles are already warm.