Hold a rope handle in one hand in front of you with a high cable attachment with the elbow flexed and palm facing inward. Keeping the trunk braced tightly, and the elbow close to the side, extend the elbow maximally, then return to the top under control.
 
Purpose
The rope tricep pushdown is an effective way to isolate the triceps for strengthening elbow extension and general elbow stability. The rope handle increases grip work and the neutral grip shifts somewhat more emphasis to the lateral head of the tricep than a pronated grip. Training a single arm at a time helps develop and preserve symmetry side to side.
 
Programming
Generally sets of 6-15 reps are appropriate.