Durable and Long-Lasting: Made with high-strength stainless steel and electroplating coating, it is resistant to rust and offers excellent stability. The screw-reinforced rotating ring and knurled non-slip handle can withstand intense training. Adjustable Resistance for Everyone: Easily adjust the resistance with the high-precision screw-type knob, accommodating training intensities for everyone from beginners to professional athletes. Versatile Training for Various Sports: Mimics the quick punches of boxing, baseball swings, and kendo strikes. The rotational movement trains core, shoulder, and arm explosiveness and endurance, contributing to improved athletic performance. Compact and Portable: Fits in small homes and offices and is easy to carry. You can start training anytime, anywhere. Efficient in a Short Time: Even short sets of 30 seconds to 1 minute can elevate your heart rate and simultaneously strengthen muscle and cardiopulmonary function. This allows for efficient training that is easy to maintain even in a busy daily life.