You will need to work at 100 percent of your ability to get through this grueling fitness test. This weekend's challenge, courtesy of Todd Durkin, C.S.C.S., author of The IMPACT! Body Plan, involves two 100-yard sprints, 100 pushups, and 100 squats done at an all-out pace. The heart-pounding, muscle-blasting "horrible hundreds" circuit will test your strength, stamina, power, and mental toughness. Are you ready to try it? Watch the video below to see how to perform the challenge. When Durkin did it, he completed the challenge in 5 minutes 10 seconds. What was your time? Let us know in the comments below.

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