{"product_id":"keiser-a400-biaxial-upper-back","title":"Keiser A400 Biaxial Upper Back","description":"\u003cp\u003eThe KEISER A400 Biaxial Upper Back is uniquely engineered to isolate the upper back through a natural, converging axis of rotation that no linear rowing machine can replicate. Its biaxial movement guides users into a deeper range of motion that activates the lats, rhomboids, and traps more completely — while the A400 touchscreen delivers the high-fidelity rep-by-rep data required for elite performance coaching and clinical rehabilitation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnique biaxial axis of rotation\u003c\/strong\u003e — specifically tuned to the natural planes of upper back movement, guiding users into a deeper, more complete range of motion than any linear rowing machine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDynamic Variable Resistance\u003c\/strong\u003e — provides more resistance where you are mechanically strongest at the start of the pull, tapering as you weaken, ensuring efficient muscle challenge throughout the entire stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnilateral symmetry training\u003c\/strong\u003e — independent arms prevent the stronger side compensating; the A400 console provides separate left and right limb data for precise imbalance identification and correction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero-shock loading\u003c\/strong\u003e — low-inertia pneumatic design removes weight stack momentum, protecting the sensitive connective tissues of the shoulder and upper back from jarring forces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad-velocity profiling and drop-off alerts\u003c\/strong\u003e — rep-by-rep velocity tracking identifies performance drop-offs and alerts the user when velocity dips below a set threshold for optimal set termination\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision thumb-button adjustment\u003c\/strong\u003e — 1 lb \/ 1 kg increments for exact resistance management between sets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 64\" H x 51\" W x 48\" D (1,626 x 1,295 x 1,219 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachine Weight:\u003c\/strong\u003e 244 lb (111 kg)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance Range:\u003c\/strong\u003e 0–356 lb (0–161 kg)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement Type:\u003c\/strong\u003e Unilateral biaxial — independent arms on a converging axis\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustment:\u003c\/strong\u003e 1 lb \/ 1 kg increments via thumb buttons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplay:\u003c\/strong\u003e 15.6\" colour touchscreen\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetrics:\u003c\/strong\u003e Power, velocity, force, range of motion, bilateral symmetry\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnectivity:\u003c\/strong\u003e Wi-Fi and Bluetooth\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eStocked at FSC Mayfair because the A400 Biaxial Upper Back delivers an upper back training stimulus that is simply not achievable with any other machine — and the data to prove every rep counts.\u003c\/em\u003e\u003c\/p\u003e","brand":"KEISER","offers":[{"title":"A400 Biaxial Upper Back with A400 screen and compressor","offer_id":56003221487989,"sku":"002035","price":25306.8,"currency_code":"GBP","in_stock":true},{"title":"A400 Biaxial Upper Back with A400 screen and NO COMPRESSOR","offer_id":56003221520757,"sku":"002036","price":22098.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/4812\/1896\/files\/Keiser_A400_Biaxial_Upper_Back.png?v=1758714671","url":"https:\/\/fscmayfair.com\/products\/keiser-a400-biaxial-upper-back","provider":"FSC Mayfair","version":"1.0","type":"link"}