How To Do A Back 1½ Tuck (203C): Head Position, the Arm Swing, and the Knee-First Kickout
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The back one and a half tuck is a big milestone.
It's the first optional most divers learn with a blind entry, and it's the dive where trusting your spots and your lead-ups becomes non-negotiable.
In this breakdown I take you through the full evolution of this dive, from a first attempt all the way to expert-level board work, tuck connection, and kickout.
The habits you build here carry directly into every optional you'll ever learn. Let's get into them.
3 Key Fixes for Your Back 1½ Tuck
1. Head Down on the Takeoff - Let the Arm Swing Do the Work
The most common mistake at every level of this dive is on the takeoff: head going back too early and shoulders connecting into the arm swing. These two things are related, and fixing one often fixes the other.
On the takeoff, your eyes should be looking back toward the board. Keep the chin tucked and hold that gaze as long as you can while the legs come up to you.
Your head position determines the direction of the dive. When the head goes back immediately, the body falls away from the board, and that leads to a loss of control on the entry.
The arm swing piece is critical and counterintuitive: getting more flip speed does not come from engaging the shoulders more on the swing. It comes from relaxing them. Swing the arms hard on the way down, and then at the bottom of the swing, relax the shoulders completely and let momentum carry the arms up.
If you engage the shoulders the whole way through, your arms and shoulders connect and move as one unit — and that's when you see divers fall back away from the board. Arms should swing on their own momentum. Shoulders stay tall and out of it.
Diver Guy's Tip: Work this arm swing on the back dive and the back jump first. That's the only place you'll ever get it locked in before it shows up correctly on the one and a half. You cannot fix the arm circle on the harder dive if it isn't right on the easier ones. Get it there first.
2. Finish the Jump — Hips Slide In, Knees Last
A pattern that shows up at the intermediate level: the knees bend before the jump is fully finished. When the knees break early, the board stops pushing force through the full body and you lose height. You have to finish the jump all the way through straight knees, arms extended, before the legs start coming up into the tuck.
The other piece is hip position on the standup. As the arms come up, the hips should slide in and come into alignment with the ankles, not push back. Think about the hips being the most forward part of the body at the top of the jump, with the toes slightly in front. That's the C position that lets the board push force all the way up and the flip start cleanly. When the hips push back instead of sliding in, you're already fighting the takeoff from the moment you leave.
Keep the oscillations vertical too without any forward and back movement. Misalignment in the oscillations means instability in the core, and that shows up immediately in the final press.
Diver Guy's Tip: On the oscillations, if you see the knees going forward and the hips sliding back, that's a core stability issue. Work on vertical bouncing first before worrying about arm timing. A stable oscillation is the foundation everything else is built on.
3. Look Into the Tuck, Then Knee-First Kickout
This is where the back one and a half tuck becomes consistent. Two things, in sequence: look into the tuck, then kick knees first.
After leaving the board, keep looking back toward it. As the legs come up to you, look into the tuck. You don't have to stare at your knees; you can look through your legs as they come up. Once you connect into the tuck, look up immediately and find the water or the tip of the board. That look is your spot. The board is there, the water is there, and the kickout starts.
On the kickout: knees extend first, then the rest of the body slides through to a straighter position. Not upper body and legs at the same time. Knees first. As you get more height and more time in the air, you'll be able to hold the pike position longer at the top before kicking, but the sequence is always knees first. Arms should stay close to the body on the slide through. Arms going too wide on the exit will carry extra momentum over if the kick is even slightly high.
Diver Guy's Tip: Trust your lead-ups. If you can see the water and the board when you come around on a back flip tuck, you know you're going to make it on the one and a half. The spot doesn't disappear — it just gets faster. Build it at the simpler level first and it transfers.
Watch the Full Breakdown
In this video I go through six divers from a first attempt all the way to expert level, with two expert examples that specifically show the arm circle mechanics and the tuck connection in detail. The final diver shows what smooth oscillations, correct alignment, and a clean knee-first kickout look like all together.
Final Takeaways: Back 1½ Tuck Done Right
- Oscillations should be vertical, smooth up and down, no forward and back drift
- Eyes look back toward the board on takeoff. Chin tucked, not head thrown back
- Arm swing: hard on the way down, then full shoulder relaxation at the bottom. Let momentum carry them up
- Finish the jump with straight knees before the legs start coming up
- Hips slide in on the standup into alignment with the ankles, not pushing back
- Look into the tuck as legs come up, then look up to spot as soon as you connect
- Kickout: knees first, then slide through, arms close to the body on the exit
- Build it on the back dive and back jump before expecting it on the one and a half
If you're working on your back one and a half tuck and want personal feedback, I offer virtual coaching for all skill levels. Send in your video and I'll send back drills, voiceover notes, and technique corrections.
👉 Click here to learn more about virtual coaching
Got questions? Drop them in the comments or DM me — I answer every one.
Good luck and I'll see you on the next dive! - DG