700 to take part in the 10-kilometre course
The ToughMann Challenge will kick off this afternoon (Saturday) at Ballamoar farm in Ballaugh.
Around 700 people will take part in the 10-kilometre obstacle adventure course from 1pm - they'll battle a two kilometre run, a 1,000 ft climb, and 25 obstacles.
Marshalls and volunteers have been recruited to oversee it.
Individual and group participants are raising money for a variety of charities, including Tabitha's Trust, which is the main partner for this year's event.
It's expected the last person will cross the finish line by 4pm.
This morning's sailing cancelled due to severe gales
National Insurance Holiday Scheme to be suspended
Tynwald pays tribute to retiring MLC
Dining in the Dark evening courtesy of 'Sight Matters' to return