The bones of the vertebrate are the support system of every organism and storage of calcium which is responsible for mineral homeostasis. During the growth and development, bones are formed through modeling process and they adjust to biomechanical requirements. It implies the production and deposition of bone matrix. Second process that takes place inside the bones is bone remodeling which represents the resorption of the existent bone and production of the new one. Bone remodeling is a physiological process that constantly occurs in the body, but just like every other process, it can become pathological when the balance between those two processes is disturbed. Although bones seem as static parts of the organism, these processes are evidence of dynamics. In the remodelig process, hormones such as PTH, estrogen and calcium, as well as external factors, play a significant role. Bone remodeling meets the requirements of organism. When bone resorption becomes faster than production, decrease occures in bone density and strength as well as pathological conditions like osteoporosis. External factors that affect bone strength are physical acitivity, nutrition and lifestyle. Numerous studies have been conducted to determine which types of physical activity and sports contribute to bone density, which diet can reduce the pathological bone conditions and what kind of lifestyle has a bad impact on the support system. The aim of this paper was to make an outline of external factors that have the effect on bone remodeling and how they can contribute to bone strength or to the development of pathological conditions.