Sir Mick Jagger has taken up antigravity aerial yoga.

The 73-year-old rocker reportedly undergoes regular sessions of the tough acrobatic practice - which sees him strung up in a hammock six feet in the air performing tricky exercises using his own bodyweight - in order to stay slim and able to keep up with the Rolling Stones' demanding performance schedule.

The technique is said to increase strength, as well as boost levels of serotonin and dopamine, which can make users feel happier.

Virgin Active anti-gravity yoga teacher-trainer Nuno Campos told the Daily Mail newspaper: ''There are numerous benefits from practicing antigravity aerial yoga, most notably that it increases both muscular flexibility and joint mobility, and is particularly helpful in strengthening the core.

''It also offers muscular tension release through decompression and hydration of the vertebral discs within the spinal column. ''This allows for more space for the nerves within the spinal cord, which can ease pain and effectively help elongate the spine.

''One of the best aspects of aerial yoga, like more traditional yoga forms, is mindfulness.

''Although it is a tough workout, afterwards you feel amazing due to the release of all the so-called 'happy hormones'.''

Mick reportedly covers 12 miles during his energetic stage performances, and so to maintain the best physical condition he can, the 'Paint It Black' hitmaker - who is to be a father for the eighth time when ballerina Melanie Hamrick gives birth in the coming months - works out six days a week.

As well as the antigravity yoga sessions, the veteran singer also performs ballet, weight-training, and pilates, and goes jogging, and employs a full-time personal trainer.