The Bayer Leverkusen legend netted 151 goals in 12 seasons at the BayArena.
And he has revealed that his stunning wife Norina would put on his heart rate monitor to do pre-season training, sticking to prescribed workouts.
Kiessling told Bild: "I never did 100 per cent of the exercises in the preparation periods, not once.
"You get a heart rate monitor on which all runs are saved.
"As my wife is very athletic, she did some racing with the wristband according to my specs.
Matthias Ginter hugged by wife in hospital after fracturing jaw and eye-socket in horror head clash
MATTHIAS GINTER was hugged by his wife after suffering a horrible head injury.
The Borussia Monchengladbach and Germany star was stretchered off the pitch after a horror head clash during Sunday’s 4-1 win over Hanover.
Ginter collided with Noah Sharenren Bazee, leaving both with bloody heads and the latter with concussion.
But it turns out Ginter had suffered the worst damage after being taken to hospital.
The former Borussia Dortmund ace was diagnosed with a fractured eye socket AND jawbone.
And he has since undergone surgery to fix the problems, sparking an emotional picture from his wife Christina, who labelled him: “My everything.”
READ MORE ABOUT MATTHIAS GINTER'S HORRIFIC INJURY
"She did it so well that nobody noticed."
That is not to say that six-cap Germany international Kiessling was a slouch in his playing days.
He claims he was "always in the lead" when he got back on the training pitch ahead of a new season.
Kiessling retired at the end of last season and is now working under Rudi Voller as assistant sporting director at Leverkusen.
The club's supporters put on a massive mosaic of his face with the word "DANKE" in massive lettering when he retired in May, such was his standing at the Bundesliga club.
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