Upgraded Breathing Trainer, Portable Resistance Exercise Device with Dual-Adjust System for Max-Improve Strength & Endurance, Breathe Fitness Trainer for Sports & Training

?[Dual Resistance Adjustment System， More Refined] Thanks to the innovative bilateral resistance adjustment design， this latest generation of breathing resistance trainer can be customized to adjust different resistance values on both sides to meet the training needs of more people at different stages!
?[Provide Maximum Training Effect] Lacvik advanced breathing trainer is designed to provide the most helpful auxiliary exercise device for breaking through the limits of personal sports training， so that you can maximize the effect of each training as expected!
?[Safer & More Comfortable to Use] The mouthpiece of this breathing fitness trainer is made of higher quality medical grade silicone material， and the unique triangular anti-slip particle design makes it more secure when biting. Even if worn for a long time， it is comfortable enough!
?[Lightweight & Portable] This breathe trainer weighs only 1.97 ounces. The overall design is ultra-compact and the small size is very convenient to carry. Suitable for more use scenarios such as fitness training， running， yoga， swimming， athletics， cycling and other high-energy sports!
?[Scientific Training Guidance] This breathing exercise trainer is very simple to use. Just practice two or three times a day with 10-20 times repetitions of deep inhalation and slow exhalation. According to tests， after about 30 days of breathing training， you will have the strength to blow up a standard-sized balloon with one exhalation!