Barbell calf raises is a pretty easy exercise to execute, as long as you're handling a weight you can comfortable stand with on your back. The main muscle worked for this exercise are your calves. For this exercise, you just need a barbell (and weights added if you can handle more weight).
1) Place the bar on your back and lift off the rack.
2) Step back a few steps. Position legs shoulder width apart.
3) Raise your heel and flex your calves. Go down back slowly to the starting position.
-Do this exercise in a squat rack with the safety bars included. Just in case!
-Keep the knee stationary.
-You may place a plate under the ball of your feet for a better range of motion.