Make sure you to warm up to get the blood flowing. 4-8 min light jog. Next, make sure you stretch you calves, quads, hamstrings, hips, dorsi flexor, shoulders,and pecs. If you don't know how to stretch properly, find out, we don't want you to pull a hamstring or anything else by jumping into sprints. The older you are, the less flexible you will be and more stretching will be necessary. After your done stretching do some sprint drills. Knee ups, leg kicks, A skips, B skips, lunges, backwards running,etc. Tell you what, you should go to a local track team and talk to the coach, collegiate or high school. You will learn what you need to know in warmup,stretching, sprint drills and workouts by visually seeing what they do. Like I said don't just jump into it, it may strain or even tear a muscle if you do not do the things I've mentioned.