Exercise bikes and treadmills have good fitness effects. Exercise bike is more suitable for the elderly, while treadmill can switch many modes, which is more practical, depending on your preference. As for the sports safety issues that the elderly care about, I suggest you turn off the brand first, and then see if the equipment has anti-skid design and heart rate monitoring. According to my personal fitness experience, the Nordick series under the American Aikang Banner is worth recommending.