"Backwards Death By 10 Meters"...

Two cones will be set up 10 meters apart from one another- the 1st min. you will run 1 10 meter, the 2nd min. you will run 2 10 meters (from 1st cone to 2nd cone and back) and so forth until you cannot complete the appropriate 10 meters in the allotted time. Only you run backwards.

12 rounds plus 110 meters

Check out this article on the benefits of running backwards

1. You can still run while you are injured
   There is nothing worse than knowing you can’t (or shouldn’t) run because of pain in an area of your body. But backward running can be done whether you have a groin, hamstring, knee, Achilles’ tendon, or ankle injury. You can also continue to run if you have back pain or shin splints.
2. You will improve your muscular balance
   Running backward will strengthen the opposing muscle groups that you normally work when running forward. Forward running puts a lot of pressure on the hamstrings and knees. Backward running will strengthen your calves, quads and shins to balance your muscular strength.
3. You burn more calories
   It has been said that taking 100 steps backward is the same as taking 1,000 steps forward, and that going backward burns a fifth more calories than running forward. Not only is this great to enhance weight loss, but for those who are busy, going backward burns more calories in a shorter period of time. This gives everyone the chance to work out, no matter how hectic your schedule.
4. Improved leg speed and better performance
   Running backward requires more effort in terms of movement because it is more difficult to move from one point to another. This effort also results in greater cardiovascular efficiency and increased stamina. Because of this, running backward may help improve your times when you’re running forward.
5. You posture will improve: many runners will slouch, drop their head, and lean too far forward. This is especially true when runners are tired, and often results in lower back pain. But with backward running, you will naturally keep your back straight as you move. The added benefit to running with straighter posture? You will work your core abdominal muscles as well.
6. Your senses will be heightened
   Since you can’t see what is in front of you, it is important to use your other senses to help navigate. By running backward, your sense of hearing and your peripheral vision will become more acute.
7. You will have fun
   You might get some strange looks, but mixing up your running will add variety and excitement to your regular routine.

Via - runaddicts.net