Hello, Sudden click followed with knee pain on the same day would be serious injury. In your case, Pain developed after couple of days. It must be a simple strain.. Nothing to worry. It happens for the beginner exerciser. Remember, never blame an exercise. Have you gone through a preliminary "Global Musculo Skeletal Assessment" before you start you training program? This will help in designing a individual specific exercise program. What types of knee exercises you did?

Hello there...... If you have leg pain from cramps or overuse, take these steps first: Rest as much as possible.Elevate your leg....Apply ice for up to 15 minutes. Do this 4 times per day, more often for the first few days....Gently stretch and massage cramping muscles....Take over-the-counter pain medicines.... Other treatment options will depend on the cause of your leg pain..... Consult Orthopedician.....