If used outdoors at temperature below 50F, the plastic will become brittle and may break. Use on flat, dry surfaces. Avoid slippery or uneven surfaces or debris. Check equipment for damage before use. The use of safety gear is recommended. Start by jogging in place before moving on to running and more strenuous activity.
For non-professionals, in order to have a better bounce effect, please bounce your feet alternately when using your jumping shoes.