STEALTH PLANKSTER IS THE NEW PORTABLE AND COMPACT HEALTH CLUB QUALITY FITNESS PRODUCT that will push you to a new level of core training in the privacy of your own home. Supports up to 250 lb user. FITS ANY SIZE SMARTPHONE FOR A FUN ENGAGING WORKOUT. Stealth takes one of the most basic training exercises, the plank, and turns it into a full-on gaming experience. GET A STRONG CORE AND A HEALTHY BACK in under 3 minutes a day. Stealth Plankster uses your core strength to control the action on your mobile phone screen, making static exercises like the plank more engaging for your muscles and your brain. NEVER DO BORING PLANKS, or sit-ups or crunches! Stealths Interactive Core Trainer makes core planking workouts fun and exciting by integrating mobile gaming. STEALTH PLANKSTER features a proprietary design with 360 degree full range of motion for superior dynamic planking. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.