Hi Priyanka,
Weight training exercises includes medium to high intensity exercises. Medium intensity exercises are like done with least weight sufficient enough to load your muscles. You can all sort of weight training exercises like push ups, lateral raises, front raises, rowing, etc. but with less weight say 2.5-3 kgs 15 counts for 3 sets depending on your fitness level while same exercises when are done with heavy weights are will come under high intensity exercises with less counts and less sets. Medium intensity exercises are for the peoples who want to just tone their muscles and reduce fat from that part while high intensity exercises are for building muscles.