TRX Triceps Extension
What Is the TRX Triceps Extension?
TRX Triceps Extension is an isolation exercise that primarily targets the triceps and also engages the core, lats and shoulders as stabilizers. It is an intermediate-level movement performed on a suspension trainer: you stand facing away from the anchor, lean your body weight into the handles and bend your elbows so your head travels toward your hands, then straighten your arms to press yourself back up. Your own body weight is the resistance, and how far you lean sets how much of it you are lifting.
The main appeal is direct triceps work wherever a strap can be anchored, with no dumbbells, bars or cable stack needed. That makes it a regular in suspension training classes, home and travel workouts and circuits. It usually sits after the main pressing work of an upper-body or push session, in the same slot a cable pushdown or skull crusher would fill, and it pairs naturally with the TRX Chest Press and TRX Row in a strap-only session.
All three heads of the triceps straighten the elbow here. Because your arms are raised in front of you, the long head, which also crosses the shoulder, works from a more lengthened position than it does in a pushdown with the arms at your sides. The movement is often described as a standing Barbell Skull Crusher, but the whole body has to stay rigid like a plank, so the abs and glutes work throughout, and the lats keep the upper arms from being pulled overhead by the straps. Leaning further makes it harder, bringing the hands further behind the head adds range, and a single-arm version is reserved for advanced lifters.
It suits anyone who wants to build triceps strength and size with minimal equipment, provided they can already hold a solid plank and do a few clean push-ups. If it feels too hard even when standing nearly upright, build up first with Incline Push-Ups, Bench Dips or a Cable Triceps Pushdown With Rope, then come back to the straps with only a slight lean.
Muscles Worked
- Triceps Brachii (Long Head)
- Primary
- Latissimus Dorsi
- Medium
- Rectus Abdominis
- Medium
- Deltoid
- Low
- Teres Major
- Low
Instructions
- Adjust both straps to the same length, about mid-length, and stand facing away from the anchor point.
- Hold one handle in each hand with an overhand grip, palms facing down, and extend your arms straight out in front of you at about chest height with your hands a little narrower than shoulder-width.
- Set your feet together and lean forward until the straps are taut, keeping your body in a straight line from head to heels. Brace your abs and squeeze your glutes.
- Keeping your elbows pointing forward and your upper arms close to where they started, bend your elbows and let your body tip forward as your hands travel back toward your head.
- Lower until your hands are beside your forehead and your head is between the straps. Your weight shifts toward the balls of your feet as you lean.
- Pause briefly, then press through the handles and straighten your elbows to push your body back to the start position, keeping your hips in line with your shoulders.
- Exhale as you press up and repeat for the planned number of reps.
Common Mistakes
Sagging hips
Letting the hips drop or pike breaks the straight body line, loads the lower back and takes tension off the triceps.
Flaring the elbows
Letting the elbows drift out to the sides shifts the work toward the shoulders and adds stress to the joints.
Dropping the upper arms
Letting the elbows sink toward the ribs as you bend turns the rep into a press, so the chest and shoulders take over from the triceps.
Leaning too far too soon
Starting at a steeper angle than you can control leads to rushed, shallow reps and a higher chance of stalling at the bottom.
Slack straps at the top
Standing too upright between reps lets the straps go slack, so the load jerks back on at the start of the next rep.
Cutting the range short
Stopping the elbow bend well before your hands reach your head reduces how much the triceps work on each rep.
Injuries
TRX Triceps Extension is a medium risk exercise when performed with proper technique. The elbows take the most stress, because they bend deeply while carrying part of your body weight, and some people find this aggravates existing elbow pain. The shoulders are the next strain point, since the arms are raised and the straps pull them up and back, and the lower back takes over if the hips sag out of a straight line.
Check that the anchor is secure and both straps are the same length before every set, and start with a lean you can control for every rep. Keep your elbows pointing forward rather than flaring out, lower slowly, and stop each set short of failure. If a rep does stall at the bottom, step one foot forward to take the weight off your arms instead of letting your face drop toward the handles.
To make it easier, stand more upright, shorten the range so your hands stop in front of your forehead, or switch to a Cable Triceps Pushdown With Rope, which loads the elbow with your arms at your sides. To progress, lean further, slow the lowering phase or pause at the bottom, and keep the single-arm version for when two-arm reps feel easy at a steep lean.
Stop if you feel sharp pain at the back or inside of the elbow, pinching at the front of the shoulder, low back pain, or numbness or tingling in the hands.
- Primary Focus
- Triceps
- Equipment
- Suspension trainer and body weight
- Modality
- Strength
- Difficulty
- Intermediate
Alternative Exercises
Other Names for the TRX Triceps Extension
The TRX Triceps Extension is also known as:
- TRX Skull Crusher
Frequently Asked Questions
- Q: How do I make the TRX Triceps Extension harder or easier?
Change your lean: step your feet closer to the anchor point to lean further and make it harder, or step away to stand more upright and make it easier. When strap load was measured during TRX push-ups, the straps carried more of the body weight the closer the body was to horizontal, and more with the elbows bent than straight, reaching about three quarters of body weight at the lowest angle tested.
- Q: How should I set the straps for a TRX triceps extension?
Set both straps to the same length, around mid-length, so the handles hang at about waist to chest height. What matters most is that the straps are taut when you lean into the start position and stay taut through every rep.
- Q: Is the TRX Triceps Extension the same as a skull crusher?
Not exactly. It uses the same elbow action as a Barbell Skull Crusher, but you stand and move your own body toward your hands instead of lying on a bench and lowering a bar, so the load comes from your lean and your whole body has to stay braced.
- Q: Can beginners do the TRX Triceps Extension?
Yes, if they start with only a slight lean, which takes much of the body weight off the arms. Anyone who cannot yet hold a straight plank or control the lowering phase should build up with Incline Push-Ups or Bench Dips first.
- Q: Should my hands finish at my forehead or behind my head?
Finishing with your hands beside your forehead is the standard depth. Letting them travel further behind your head adds range and stretch but asks more of the elbows and shoulders, so go deeper only if it stays pain-free.
- Q: How many sets and reps should I do?
Most people do 2 to 4 sets of 8 to 15 reps. Choose a lean that makes the last few reps of each set hard while your body line and elbow position stay clean.