{"product_id":"portable-lung-capacity-abdominal-breathing-trainer-with-adjustable-resistance-lmprove-your-lung-capacity-and-sleep-quality","title":"Muscle Trainer – Endurance \u0026 Strength Device","description":"\u003c!-- HERO STATEMENT --\u003e\n\u003ch2\u003eTrain Your Lungs. Perform Beyond Your Limits.\u003c\/h2\u003e\n\u003cp\u003eMost athletes train their legs, their arms, their core — but forget the one muscle that controls everything: their breathing. The \u003cstrong\u003eGravix™ Muscle Trainer\u003c\/strong\u003e is a resistance breathing trainer designed to strengthen your respiratory muscles, expand your lung capacity, and keep you performing at full intensity — even when others are gasping.\u003c\/p\u003e\n\n\u003c!-- KEY BENEFITS --\u003e\n\u003ch3\u003eWhat You'll Feel Different\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLess winded during sprints, HIIT, and cardio\u003c\/strong\u003e — your lungs can finally keep up with your body\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDeeper, stronger breaths under pressure\u003c\/strong\u003e — more oxygen, less fatigue, longer sessions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFaster recovery between sets\u003c\/strong\u003e — you reset quicker, so you push harder\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNoticeable results in 7 days\u003c\/strong\u003e — just 5–10 minutes a day is all it takes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- HOW IT WORKS --\u003e\n\u003ch3\u003eHow It Works\u003c\/h3\u003e\n\u003cp\u003eThe Gravix™ Muscle Trainer uses an \u003cstrong\u003eadjustable resistance valve\u003c\/strong\u003e that restricts airflow as you breathe, forcing your diaphragm and intercostal muscles to work harder — exactly like resistance training, but for your lungs. Over time, your respiratory muscles grow stronger, your VO2 max improves, and every workout feels easier.\u003c\/p\u003e\n\u003cp\u003eDial up the resistance as you progress. Start easy, go hard. Your call.\u003c\/p\u003e\n\n\u003c!-- SPECS --\u003e\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 68g — fits in any pocket or gym bag\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMouthpiece:\u003c\/strong\u003e Medical-grade silicone, detachable and easy to clean\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResistance:\u003c\/strong\u003e Adjustable rotary valve — beginner to advanced\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRecommended use:\u003c\/strong\u003e 5–10 minutes per day\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e All fitness levels — athletes, beginners, active adults\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- SOCIAL PROOF NUDGE --\u003e\n\u003ch3\u003eTrusted by 20,000+ Athletes\u003c\/h3\u003e\n\u003cp\u003e98% of users reported improved stamina within 2 weeks. Whether you run, lift, cycle, or play team sports — the Gravix™ Muscle Trainer belongs in your training kit.\u003c\/p\u003e\n\n\u003c!-- GUARANTEE --\u003e\n\u003cp\u003e\u003cstrong\u003e30-Day Money-Back Guarantee.\u003c\/strong\u003e Train with it. Feel the difference. If you don't, we'll refund you — no questions asked.\u003c\/p\u003e","brand":"gravixcare","offers":[{"title":"Black","offer_id":51933395976477,"sku":"14:173#Black","price":19.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0998\/3967\/2605\/files\/S1f32cf36cf704015a2136c30cffd587dg.webp?v=1782667571","url":"https:\/\/gravixcare.co\/products\/portable-lung-capacity-abdominal-breathing-trainer-with-adjustable-resistance-lmprove-your-lung-capacity-and-sleep-quality","provider":"gravixcare","version":"1.0","type":"link"}