Founded in 2005, it is a brand of Acorn International Electronic Technology (Shanghai) Co., Ltd. In 2007, Yierjian was successfully selected for the Best Brand Progress Award of the Year in Zhejiang Province, and its annual sales in 2009 exceeded 100 million. Yierjian's all-round abdominal machine is known as a fitness machine that supports "hanging gear", with 4 adjustable difficulty gears, 6 manganese steel double helical alloy springs on the left and right sides, with a degree of relaxation, safety and strength, uniform rebound, and the training intensity can be adjusted arbitrarily. Seiko forged high-strength tension rope, good elasticity, good elasticity, long-term tension without deformation. The product has passed the GB174981.1-2008 national standard, which can realize 32 kinds of exercises, and a machine can efficiently exercise the muscles of the whole body at home. The Excellence Limited Edition also has a feel-like bicycle wheel, which is great for exercising the lower abdomen. The flagship version is 299 yuan, the price is not high, and it is very worth buying.