Downhill running is another method of building speed and is known as gravity-assited running. You can use an outdoor area that is clear of obstacles and has a downward slope, or you can use a treadmill that has a decline feature. It is easy to pick up speed so use caution. Just like resisted running, you can do eight to 15 reps with one to four minutes of rest between bouts. Perform the downhill run for either time or distance.

Agility drills such as the shuttle run have you moving as quickly as you can with changes in direction. If you are new to agility drills start slow and gradually pick up your pace. To do the shuttle run like the one used at the University of Notre Dame, you need a flat surface clear of debris. Tape three lines on the floor, or use cones, that are 5 yards or 15 feet apart. Start at one line. Sprint to the first line, touch it and sprint back to the starting line. Touch the starting line and sprint to the furthest line. Touch it and sprint back through the starting line to finish the drill. Perform five to 10 shuttle runs with one to four minutes rest between them. Do this one to three times each week.

Set up four cones so they form a square. Each cone should be about 5 yards or 15 feet apart. For this drill, face the same direction the whole time while making your way around the cones to form a square. Start at the back left corner. Sprint forward just past the cone at the top left corner. Side shuffle to your right as fast as you can and go just past the cone at the top right corner. Run backwards to the cone behind you and side shuffle left to the first cone to finish the drill. Alternate directions and do the drill eight to 15 times with one to four minutes rest between drills.