Strength and hypertrophy training using the RFS (Restricted Blood Flow) method has been shown to be very effective through experiments and is gaining ground every day, as it is proving to be a very beneficial way of gaining strength and hypertrophy using low weights. Some researchers have used kaatsu training or RFS in Japan and found good results in gyms, orthopaedic clinics and hospitals. In Japan, this method is already widely used, with kaatsu being used in 84% of the places surveyed. Chondropathy refers to diseased cartilage. This condition usually causes pain in the front of the knee and clicking, especially when the person squats, runs, gets up from a chair or goes up and down stairs. The more specific term for this condition is patellofemoral syndrome. Patellar chondropathy has different stages, depending on the degree of cartilage degeneration: softening, fragmentation or cracks, up to erosion or total loss. This is why it is necessary to consult a doctor immediately, even when the pain starts.