Three people rescued on Sunday for attempting the Grouse Grind

.@DNVFRS bringing the third and final hiker off the Grouse Grind. We’re told this patient is the most critical. pic.twitter.com/wCJcZhq7LS

— Sarah MacDonald (@CTVSarah) June 5, 2016

The District of North Vancouver Fire Department performed three rescues on Sunday at North Vancouver’s Grouse Mountain because of hot conditions. Three people, who were doing the Grouse Grind, popularly known as “Mother Nature’s Stairclimber,” were treated as temperatures topped 25 C.

RELATED: Top 10 hydration tips.

Last of 3 hikers in distress has now been returned to trailhead by District Fire Fighters pic.twitter.com/X4yiYImmuf

— DNV Fire Department (@DNVFRS) June 5, 2016

According to Daily Hive, formerly Vancity Buzz, the fire department responded to the initial distress call around 9 a.m. local time on Sunday morning. While tending to the first hiker, two others were treated for heat-related concerns while the crew was on the mountain.

Stay hydrated and know your limits. pic.twitter.com/P5Xwe7FMO5

— DNV Fire Department (@DNVFRS) June 5, 2016

The fire department told people via Twitter on Sunday to “stay hydrated and know your limits,” and to “stay safe in the trails.” The Grouse Mountain website lists 10 essentials that runners and hikers should bring when attempting the grind including water and food, a cell phone and a first-aid kit.

The Grouse Grind opened to the public on April 30. The grind is a 2.8-kilometre ascent up Grouse Mountain, located approximately 20 minutes from downtown Vancouver. The elevation gain of the climb is 853 metres and includes 2,830 steps.

RELATED: Training for the Barkley Marathons: A Grouse Mountain trail adventure.

There are a number of races that take place on Grouse Mountain each year. Some choose to run the ascent, or at least attempt to run, or walk. Those who complete the climb must take the tram down the mountain as descent on the trail is prohibited.

Canadian marathoner and popular figure in the running community Rob Watson has been seen attempting to set new personal bests on the climb recently. He went sub-30 two weeks ago.

In honour of the mighty @manchesterunited #reddevils taking the win in the FA cup-a mountain of a football tournament. I decided to tackle my own mountain today. The seasons first #grousegrind is in the legs. Gosh darn I forgot how friggen much that climb burns. Goal today was sub 30, had to lean at the line and barely made it with a 29:59 official time. #nailedit Good start, but gotta take a couple more minutes off by the end of the season. #manutd #facup #mylungshurt #sodomylegsz

A photo posted by Rob Watson (@rwatson26point2) on May 22, 2016 at 10:28am PDT