Single Arm Z Press
The single arm Z press is a strict overhead press done sitting on the floor with your legs straight out in front, holding one kettlebell. With no way to lean back or use your legs, the work falls on your triceps and the front and side of your shoulders, while your abs and obliques keep you upright. It suits lifters who want a stricter press and better trunk control, and beginners can learn it well with a light kettlebell.
Muscles worked
The Single Arm Z Press mainly works your triceps, anterior delts and lateral delts, with your abs and obliques helping.
Setting up
- Choose a light kettlebell for your first sessions, such as 4-8 kg, and place it on the floor beside your hip. Sit on a mat with your legs straight out in front, a little wider than hip width, and your heels on the floor.
- Sit tall with your ribs stacked over your hips. If you slump or your knees bend a lot, sit on a folded mat or a low step to lift your hips slightly.
- Bring the kettlebell up to the rack position: your hand around the handle, elbow tucked against your ribs, and the bell resting on the back of your forearm and against your upper arm. Keep your wrist straight, not bent back.
- Place your free hand on the floor beside you or on your thigh for balance, and brace your stomach as if you were about to be nudged.
How to do the Single Arm Z Press
- Sit tall with your legs straight out and slightly apart, your chest open and your ribs pulled down towards your hips.
- Take a breath in and brace your abs, with the kettlebell in the rack position and your elbow close to your side.
- Press the kettlebell straight up, moving your head back slightly so the bell has a clear path past your face.
- Finish with your arm fully extended, your bicep close to your ear and the bell resting on the back of your forearm directly over your shoulder.
- Pause for a moment at the top without leaning away from the weight.
- Lower the kettlebell under control along the same line until it settles back into the rack position, then reset your brace before the next rep.
- Complete all your reps on one side, then swap arms.
Form tips
- Think about pushing the floor away through your hips: stay tall and don't let the weight pull you sideways.
- Keep your forearm vertical throughout, so the handle sits over your elbow and the bell doesn't drift in front of you.
- Squeeze your free-side obliques and abs hard as the bell passes eye level. This is where most people start to tip.
- Press up and slightly back, finishing with the bell over the middle of your body, not out in front.
- Take 2-3 seconds to lower the bell. A slow descent keeps your triceps and shoulders working and protects your wrist from the bell dropping into the rack.
Common mistakes
Leaning back or sideways
Lower the weight and brace your abs before each rep. Your ribs should stay over your hips all the way up and down. If you can't stay upright, the kettlebell is too heavy.
Slumping with a rounded upper body
Sit on a folded mat or low step to raise your hips, and keep your chest open. Bending your knees slightly is fine if your legs feel tight.
Bell drifting forward
Keep your elbow under the handle and press in a straight line, finishing with your arm beside your ear. Pressing out in front makes the weight feel much heavier and tips you forward.
Bent wrist and a bell that bangs your forearm
Keep your wrist straight and let the bell rest on the back of your forearm. Control the lowering so the bell settles gently into the rack rather than dropping.
Sets and reps
| Build strength | 4-5 sets of 4-6 reps per arm, resting 2-3 minutes between sets. Use a weight you can press with perfect posture. |
|---|---|
| Build muscle | 3-4 sets of 8-12 reps per arm, resting 60-90 seconds. Lower slowly and stop a rep or two before your posture breaks down. |
| Fat loss and general fitness | 2-3 sets of 10-15 reps per arm with a lighter kettlebell, resting 45-60 seconds. Pair it with other exercises in a full-body session. |
Pick a weight where the last rep or two of each set is hard but your form stays clean. When every set feels easy, it's time to go up.
Single Arm Z Press alternatives
Machine taken, or want some variety? These work the same main muscles.
Single Arm Z Press FAQs
Why is the Z press harder than a standing press?
Sitting on the floor with your legs out removes any help from your legs and any lean-back. Your triceps, shoulders and core have to do all the work, so you will usually need a lighter kettlebell than you use standing.
What if I can't sit upright with my legs straight?
Sit on a folded mat or a low step to raise your hips, and let your knees bend slightly. Aim to keep a tall spine and open chest, and work towards straighter legs over time.
What weight should I start with for a single arm Z press?
Start light, often 4-8 kg, and aim for 8-10 clean reps per arm with no leaning. Add weight only when every rep looks the same as the first, and stop if anything hurts and get it checked.
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