Very few of us will ever have the courage or the training or the physical strength of the first responders who have been in the news this year.

CNN: In the new year, be a first responder

"All the resistance training is to ensure I have physical power and can create explosivity on court to quickly react to opponents playing fast and hitting deep, hard balls, " she says.

WSJ: To Stay on Top in Tennis, Time Off Counts

Specifically, Scott noted that officials have allowed more physical play, there has been a heavier emphasis on training and accountability and officials whose performance was deemed unsatisfactory have been replaced.

NPR: Scott: Rush's Remarks 'Not A Fireable Offense'

If you have knee problems, I highly recommend seeing a physical therapist or orthopedic surgeon for evaluation before starting a vigorous jogging training program.

CNN: Will jogging hurt an obese person's joints?

Furthermore, the study raised as its ideal the policy to which the Marines have adhered all along: single-sex basic training ("boot camp"), segregated barracks and tougher physical training.

CNN: Boys And Girls Apart