Choosing the right training chair can make a significant impact on your overall productivity and comfort while working. Here are some key factors to consider while selecting your training chair:

1. Comfort - Look for a chair with a padded seat and backrest that promotes good posture. It should also have adjustable armrests and lumbar support to offer maximum comfort.

2. Durability - Make sure that the chair you select is made up of high-quality materials that can withstand regular use for a long time.

3. Adjustability - The chair should have easy-to-use height adjustment features to cater to people of different heights.

4. Portability - If you need to move the chairs around frequently, then lightweight and portable chairs with wheels would be the best option.

5. Size and Style - Choose a chair that fits into the space available and also complements the interiors of the place effectively.

Overall, comfort, adjustability, durability, portability, size, and style are the key factors that you need to keep in mind while selecting a training chair. Make sure you choose one that best fits your needs and enhances your overall productivity.