Yes there are many things you can do to improve circulation to your extremities. Stretching, including specific stretching of your fingers and toes. If you work behind a computer all day this is especially important. Simply taking a lap around your office every 30 minutes will really help the blood flow to your extremities. Here are some other great tips.
Yoga is an excellent recommendation for all aspects if you health! I also take supplements and one aspirin daily. The aspirin thins your blood helping to increase circulation and reduce the risk of stroke, heart attack, aneurism etc... Make sure you consult you physician and or a qualified homeopath before you begin taking anything.
Making a rotating motion of each of your feet 20 times clockwise and then 20 times counterclockwise do the job for me all the time. The same apply for your hands. Also do not forget to exercise at least two times per week even if you are an active person. I am an older person and I well physically fit.
The essential oil of black pepper stimulates the blood circulation. Folks use it to heal bruising faster because it circulates the blood and warms the area. Go check it out at a site that sells essential oil of black pepper.