Jailed former tennis champ Boris Becker has shed 18 lb in prison and is teaching inmates how to keep fit with exercise, nutrition, and even meditation.

The shamed star’s German lawyer, Oliver Moser, has told local media that the former world No. 1 tennis player is thriving behind bars.

Southwark Crown Court sentenced Becker, 54, to two and a half years in prison last April for fraudulently hiding GBP 2.5 million in bankruptcy hearings.

Since mid-May, he has been incarcerated at HMP Huntercombe – a Category C men’s prison near Nuffield, Oxfordshire.

Moser told German media: “Our client Boris Becker is still doing well given the circumstances and he fits constructively into everyday prison life.”

Becker is said to have his own private cell and his behaviour behind bars has been described as impeccable.

A person close to the former athlete told German media: “He’s popular with his fellow inmates.”

According to the source, since starting his sentence, Becker has shed around eight kilogrammes (18 lb).

He is said to work out in the prison gym, abstain from alcohol – which is banned behind bars anyway – and has even become an assistant to the prison fitness and psychology coach.

According to a person close to Becker, the six-time Grand Slam winner teaches some 45 fellow inmates fitness, nutrition, crisis management, and a special type of yoga and meditation.

The source told German media: “As an athlete, he knows his way around victories and defeats. He shares his life experience with his fellow inmates.”

Becker’s ‘job’ is said to be part of a bonus programme within HMP Huntercombe. The more the inmates get involved, the more positive it is for their sentences.