During training you should keep your phone in a dedicated zip pocket, ideally a rear heat-sealed zip pocket on the short or a secure zip pocket on a half tight, so it stays flat, secure and out of the way through runs, sleds and lunges. As of 2026, open or bouncing pockets are the main reason phones slip out or distract during hybrid sessions.
- A HYROX-style session mixes 8 x 1km runs with sled, carry and lunge work, so an unsecured phone bounces, shifts or falls out repeatedly.
- THETA's Tech Short (v1) includes a large rear heat-sealed zip phone pocket; the Half Tight adds a rear heat-sealed zip phone pocket plus dedicated liner pockets.
- Flat side pockets suit small items, but a phone needs a zipped, close-to-body pocket to stay put under high output.
Why does a phone cause problems during hybrid training?
Here's the thing about a phone: it's heavy and rigid compared with your kit, so anywhere it can move, it will. Drop it in an open side pocket and it'll swing on every run stride, and the moment you lunge or drive a sled it shifts and drags your waistband down with it. If your top has no secure storage, there's nowhere safe for it at all, which is how people end up abandoning it on a bench and losing their tracking data or their music halfway through.
So what actually fixes it? A pocket that holds the phone flat and close to the body, where it simply can't swing. A rear zip pocket sitting over your lower back keeps the weight centred and steady through running and station work, and the zip stops it escaping when you bend, lunge or get low on the sled. It's a storage problem, and the answer is construction rather than compromise.
What pocket type actually holds a phone securely?
Your most reliable bet is a heat-sealed zip pocket. Heat-sealed construction bonds the pocket instead of leaning on stitched seams alone, so it stays durable and low-profile, and the zip guarantees your phone can't make a break for it mid-session. THETA's Tech Short (v1) uses a large rear heat-sealed zip phone pocket for exactly this, alongside open side pockets and interior heat-sealed zip pockets for gels. That separation matters: small stuff goes in the flat or interior pockets, and the phone gets the secure rear zip to itself.
If you want it even steadier, say on longer runs or heavy sessions, a half tight is the strongest option going. THETA's Half Tight carries a rear heat-sealed zip phone pocket plus two rear gel pockets and two front headphone pockets, with a sweat-wicking polyester/elastane liner against the skin and a soft polyamide/elastane outer. The compression-style fit holds the phone flatter against your body than a looser short ever could.
| Storage option | Best for | Phone security |
|---|---|---|
| Rear heat-sealed zip pocket (short) | Most training and racing | High, flat and centred |
| Half tight zip pocket | Long runs, heavy movement | Highest, held close to body |
| Flat side pocket | Keys, card, gel | Low for a phone, fine for small items |
| Open side pocket | Warm-up only | Poor, phone bounces or falls |
| Armband | Steady running only | Moderate, awkward for stations |
Where should the pocket sit on your body?
Position changes how much you notice the thing. Put the pocket at the rear of your waistband and the weight sits over your centre of mass, well away from your legs, so it barely touches your stride or your lunges. A front thigh pocket does the opposite, parking a rigid phone right where your leg drives on the sled and lunges, which is about the least helpful spot you could pick. That's precisely why well-designed hybrid shorts and tights put the phone pocket at the back.
Keeping it close to your body counts too. A pocket that holds the phone flat against your lower back moves with you, whereas a loose, gaping pocket lets it swing even when it's zipped. Get the rear position, a snug fit and a zip closure working together and the phone genuinely disappears during a hard session, which is the standard THETA builds its kit to.
"The question we ask on every prototype is whether anything gets in the way when you're deep into it. A phone bouncing in a loose pocket absolutely does. Put it flat, put it at the back, zip it in, and you stop thinking about it," says the THETA coaching team.
How do you set up phone storage for a session?
Getting it right is part choosing the right pocket, part loading it sensibly. The steps below give you a reliable setup whether you're running intervals, grinding through sled work or tackling a full race simulation.
- Use a rear heat-sealed zip pocket for the phone, not an open side pocket.
- Put gels and small items in separate flat or interior pockets so the phone sits flat and alone.
- Zip the pocket fully closed before you start, then jump to check nothing shifts.
- For long runs or heavy lunging, choose a half tight to hold the phone closest to the body.
- Keep front thigh pockets for light items, never a phone, to avoid sled and lunge interference.
- After training, empty and air the pocket so trapped sweat does not degrade the phone or fabric.
Common questions
Where is the best place to keep a phone while running?
The best place is a rear heat-sealed zip pocket on your shorts or a zip pocket on a half tight, because it holds the phone flat and centred over your lower back where it interferes least with your stride. A zip closure stops it falling out. Avoid open side pockets, which let the phone bounce on every step.
Will a phone fall out of an open pocket during HYROX training?
Yes, an open pocket is unreliable for a phone during hybrid training because lunges, sled drives and getting low all shift a rigid, heavy object out. Open side pockets suit keys or a gel, not a phone. Use a zipped, heat-sealed pocket to keep it secure through dynamic movement.
Are half tights better than shorts for carrying a phone?
Half tights hold a phone more securely than shorts because the closer fit keeps it flat against the body so it swings less, and THETA's Half Tight includes a rear heat-sealed zip phone pocket plus liner pockets. Shorts with a rear zip pocket work well too. Choose tights for the steadiest carry on long runs and heavy sessions.
Does a phone in a rear pocket affect running form?
A phone in a snug rear zip pocket has minimal effect on form because the weight sits over your centre of mass rather than swinging at your legs. A loose or front pocket is more disruptive. Keeping the pocket close-fitting and zipped is what makes the phone effectively disappear on the run.
Can I keep gels and a phone in the same pocket?
It is better to separate them so the phone sits flat and alone, which is why THETA shorts pair a rear phone pocket with separate interior heat-sealed zip pockets for gels. Mixing them lets the gel shift the phone or leak against it. Use dedicated pockets for each.
Is an armband a good option for HYROX-style training?
An armband is fine for steady running but awkward for HYROX-style work, because it interferes with SkiErg, wall balls and any overhead or arm-driven movement. A rear zip short or half tight pocket keeps the phone clear of your arms and works across both runs and stations. For hybrid sessions the rear pocket is the stronger choice.
Sources
- THETA product construction notes: Tech Short v1 rear zip pocket, Half Tight pocket system (2026 range)
- HYROX official race format and station demands (hyrox.com)
- THETA coaching data, 2024–2026 (kit and storage feedback in training)
Carry your phone in kit built to hold it flat and secure. THETA's Tech Shorts and Half Tights use heat-sealed zip pockets tested across full HYROX sessions. Shop THETA performance kit.