Third Class Lever – The effort is in the middle between the fulcrum and the load
During a bicep curl as shown below the fulcrum is the elbow joint, the effort is the bicep muscle contracting and the load is the resistance of the weight that is being lifted.
Note: The arrow on effort and load can be either way.
Third class levers are seen when you use tongs.
Or seen when you move soil with a shovel.