The best osteoporosis exercise for building bone density is moderate-to-high load resistance training or osteogenic loading — both of which apply sufficient mechanical force to the skeleton to trigger the bone-building process (osteogenesis). Balance training and postural exercises are also important for reducing fall and fracture risk. Low-impact activities such as walking, swimming, and yoga support general health but do not directly improve bone mineral density. Always consult your healthcare team before starting a new exercise program.