When choosing a respiratory trainer, consider the following aspects:

1. **Training purpose**: – **

Improve lung function: If you have a respiratory disease, have undergone chest or abdominal surgery, and need to improve lung function and enhance the strength and endurance of respiratory muscles, then choose a respiratory trainer that can provide appropriate resistance and help with deep breathing training, such as a three-ball respiratory trainer. This type of trainer can increase the resistance of breathing movements and allow the respiratory muscles to get better exercise. – **Enhance athletic performance**: For athletes or people who often engage in high-intensity exercise, if you need to enhance the strength and endurance of respiratory muscles to improve oxygen supply and carbon dioxide excretion efficiency during exercise, you can choose a respiratory trainer with a large resistance adjustment range and able to meet the needs of different training intensities. Some professional respiratory trainers will also be designed according to the characteristics of sports training, such as paying more attention to the training of rapid conversion between inhalation and exhalation. – **Daily health care**: If you just want to carry out daily breathing health care and maintain good respiratory function, then choose a respiratory trainer that is easy to operate and has moderate resistance. For example, some portable small respiratory trainers are convenient to use at any time.

2. **Type and function**: – **

Inspiratory trainer**: Mainly exercises the inspiratory muscles and helps improve the strength and depth of inhalation. Suitable for people with weak inspiratory function or those who need to enhance inspiratory ability, such as patients with chronic obstructive pulmonary disease and long-term smokers. – **Expiratory trainer**: Focuses on exercising the expiratory muscles and helps improve the strength and control ability of exhalation. It is more suitable for people who need to expel residual gas in the lungs and improve exhalation function, such as asthma patients and the elderly with poor lung function. – **Comprehensive trainer**: It has both inspiratory and expiratory training functions and can comprehensively exercise the respiratory muscles. It is a relatively universal choice and is suitable for most people who need respiratory training.

3. **Resistance adjustment function**: – **

Adjustability**: It is best to choose a respiratory trainer with adjustable resistance so that you can adjust the training intensity at any time according to your training progress and physical condition. For example, you can choose a lower resistance at the beginning of training and gradually increase the resistance as the strength of the respiratory muscles increases. – **Resistance range**: Understand whether the resistance adjustment range of the respiratory trainer meets your needs. If the resistance range is too small, it may not be able to meet the increase in training intensity; and if the resistance range is too large, it may be too difficult for beginners and easily lead to injury or fatigue.

4. **Ease of use and comfort**: – **

Simple operation**: Choose a respiratory trainer that is easy to operate, easy to understand and use. This is especially important for the elderly or people with cognitive impairments. Some respiratory trainers may be equipped with clear displays or indicator lights that can intuitively display training parameters and progress, making it convenient for users to use. – **Comfortable wearing**: The interface, mask or mouthpiece of the respiratory trainer should be comfortable to contact with the body. The material should be safe and non-toxic and will not cause irritation or allergy to the skin. At the same time, the weight of the respiratory trainer should be moderate and easy to carry so that it can be used in different scenarios.

5. **Quality and reliability**: – **

Brand and reputation**: Choose a respiratory trainer with a well-known brand and good reputation, and the quality is more guaranteed. You can understand the product quality and performance of different brands through online evaluations, doctor recommendations, and evaluations by professional institutions. – **Certification qualifications**: Ensure that the respiratory trainer has relevant medical device certification qualifications (if it is used for medical rehabilitation purposes), such as a medical device registration certificate. This is an important guarantee for product quality and safety. – **Durability**: Check whether the material and structure of the respiratory trainer are sturdy and durable and can withstand long-term use and frequent operations. Some high-quality respiratory trainers may use high-quality plastics, silicones and other materials and have better anti-drop and compression resistance.

6. **Price**: –

**Budget range**:

Determine the budget range for purchasing a respiratory trainer according to your economic strength. The price of respiratory trainers varies depending on brands, functions, quality and other factors. Generally speaking, household respiratory trainers with relatively simple functions have a relatively lower price, while professional-level respiratory trainers have a higher price. –

**Cost-effectiveness**:

Within the budget range, choose a respiratory trainer with high cost-effectiveness, that is, a product whose performance and quality can meet your needs and the price is relatively reasonable. Don’t just pursue a low price and ignore the quality and function of the product.