Final answer:
Regular physical activity is not a risk factor for venous thrombosis and is often recommended to prevent it. Conversely, endothelial injury, venous stasis, increased age, and hypercoagulability are risk factors for venous thrombosis.
Step-by-step explanation:
The risk factors for venous thrombosis include endothelial injury, venous stasis, increased age (greater than 45 years old), and hypercoagulability. However, regular physical activity is not a risk factor for venous thrombosis; in fact, it is typically recommended to prevent it, as it can improve circulation and reduce the risk of blood clots. Conditions such as thrombocytosis and thrombophilia contribute to an increased risk for thrombosis, whereas regular movement, including walking and leg exercises, is beneficial, especially during situations such as long-distance flights that increase the risk of DVT (Deep Vein Thrombosis).