COLORADO SPRINGS, Colo. -

It’s a tough task racing 70 miles around Colorado Springs, but for organizers of the USA Pro Challenge bike race keeping cyclists safe is a challenge in itself.

Colorado Springs hosted stage four of the USA Pro Challenge.

More than 100 of the best bikers in the world competed.

Organizers said they go to great lengths to keep fans and racers safe.

“Hundreds of course marshals, 150 of our own staff to help out, over the course of the weekend we have more than 4,000 volunteers to help out, most of them as course marshals,” Race Technical Director Chuck Hodge said.

Workers for the race plan more than a year in advance to get the course up to their standard.

The parts of the course organizers were keeping an eye on were Garden of the Gods and downtown Colorado Springs.

“In front and behind we have police officers as well as motorcycle marshals and staff members to keep crowds back,” Hodge said.

Stage five of the race will start tomorrow in Woodland Park at 11 a.m.