While researching outside-the-box training techniques, Fieldbinder said he happened upon the teachings of Alan Jaeger, a California-based coach who has consulted with several major-league clubs, including the Texas Rangers.

WSJ: Dylan Bundy, Trevor Bauer, Matt Barnes: Throwing Long to Throw Short

Aetna tested the software of the three main real-time on-line training suppliers for six months (see box).

FORBES: Good morning, HAL

Williams, 34, is training for a Spar-a-thon, attempting to box over 100 rounds with the members at Wye ABC.

BBC: SPORT | Boxing | Williams to get back in the ring