Time your dead hangs, planks, and wall sits with precision. Track your progress. Beat your records. No equipment, no gym, no excuses.
The Science
You hold a position. Your muscles fire. That's it. Isometric training is one of the most studied and least used methods in exercise science, and the research keeps stacking up.
A landmark 2023 British Journal of Sports Medicine meta-analysis found isometric exercises are the single most effective exercise type for reducing blood pressure — more than aerobic, dynamic resistance, or HIIT training.
Dead hangs strengthen grip, decompress the spine, and build shoulder stability. Planks forge an iron core. Wall sits develop leg endurance. These exercises target the stabilizer muscles that machines miss.
No impact. No momentum. No joint grinding. Isometric holds are the go-to rehabilitation method for tendon injuries and are safe for virtually any age or fitness level. Low risk, high reward.
Holding still while your body wants to quit is a skill. The longer you practice it, the better you get — not just at holds, but at anything that requires staying steady under pressure.
A full session takes 5–15 minutes. You can do it at home, at the office, anywhere with a floor and maybe a bar. Most people fit it in before their morning coffee.
Isometric exercises increase tendon stiffness and collagen synthesis. They're the #1 recommended rehab protocol for tendinopathy and the best way to build connective tissue resilience before it becomes a problem.
Why It Matters
Wall sits alone can drop systolic BP by 10+ mmHg in 8 weeks. That's on par with first-line hypertension drugs, according to a 2023 BJSM meta-analysis.
Planks and dead hangs are the two most recommended exercises by physiotherapists for spinal health. Strengthen the muscles that protect your back.
Grip strength is the #1 predictor of longevity in older adults. Dead hangs are the single best exercise for building crushing grip strength.
Plank in your living room. Wall sit at your desk. Dead hang from a park bar. The only equipment you need is gravity.
From teenagers to seniors, isometric exercises can be scaled to any fitness level. Low injury risk makes them perfect for beginners and rehab patients alike.
A strong core isn't about six-pack abs — it's the foundation for everything. Isometric planks build deep stabilizer muscles that crunches can never reach.
Whether you run, lift, swim, or do yoga — isometric holds make every other exercise better by strengthening the weak links in your kinetic chain.
Isometric exercise training is the most effective mode for reducing both systolic and diastolic blood pressure.
— British Journal of Sports Medicine, 2023
Meet the App
Not just another timer. Hold Strong is a precision isometric training system with beautiful design, smart tracking, and features that keep you coming back.
Exercise Dashboard
Quick targets, personal bests, daily goals
Precision Timer
Beautiful tension arc at 60fps
Overtime Mode
Golden glow when you crush your goal
Progress Tracking
Records, streaks, and workout history
Features
Watch your hold come alive. The timer fills as you go, with particles and glow that build as you get closer to your target. It's the kind of thing that makes you want to hold five more seconds.
Automatic tracking of your longest holds. See your personal best, daily attempts, and full session history with trophy markers for your top performances.
Completely hands-free operation. Say "start", "stop", "pause", or "next exercise" — perfect for mid-hold when your hands are occupied.
Hands FreeVisual bar charts showing your progress over time. Track average hold times, completion rates, and best streaks across all your exercises.
A full-featured companion app for your wrist. Independent workout tracking, haptic feedback, and extended runtime for long sessions. Your exercises sync automatically.
Your phone knows when you drop. If you break position, the timer stops automatically. You can dial the sensitivity up or down — but your records stay honest.
Hear your time called out as you hold. Over 200 messages, specific to each exercise, play alongside your music without cutting it off. It's like having a coach who knows when to shut up.
Your holds show up in Apple Health automatically — duration, calories, everything. You can also batch-export past sessions if you've been tracking for a while.
Launch any exercise hands-free with Siri. Say "Start Dead Hang in Hold Strong" or "Choose exercise in Hold Strong" to jump straight into a session — no tapping required.
PremiumForest, Ocean, Earth, Lavender, Midnight, and Ember. Each theme is a complete color system designed for readability during intense workouts.
Simple Pricing
No subscriptions. Pay once, use it forever. That's the whole pricing model.
$0
$4.99 one-time
Five minutes a day. That's a dead hang, a plank, and a wall sit. Download it free and see how long you can hold.
Download on the App Store