Spring and summer are packed with opportunities to get moving in and around Denver. Whether you want to try a new workout, challenge yourself with a race, or just enjoy a morning of fitness with the community, these events are a great way to stay motivated. Here are some top picks this season:
Saturday, May 17th, 2025
Denver Fitness Sampler
Class Schedule:
- 9:30 AM – Physio Yoga with Embody Therapy
- 10:00 AM – Full Body Barre
- 10:30 AM – Mind & Body Fitness Fusion
- 11:00 AM – Booty & Abs with MJ Fit
- 11:30 AM – Sculpt & Sweat with Jazzercise
- 12:00 PM – Sound Bath Wind Down
Other perks:
Expect light snacks, coffee, wellness booths, and shopping between sessions.
Where: Kimpton Claret Hotel, 6985 E Chenango Ave, Greenwood Village, CO
When: Saturday, May 17th | 9:00 AM–1:00 PM (doors open at 8:45 AM)
Register: Denver Fitness Sampler
Saturday, May 17th – Sunday, May 18th, 2025
Denver Colfax Marathon Weekend
The Colfax Marathon is one of Denver’s most iconic fitness weekends. Whether you’re aiming for a full marathon, a half, or something shorter like the Urban 10 Miler or the 5K, this event has a race for everyone.
The courses are known for their scenic urban views and pass through iconic Mile High City’s major landmarks like the Colorado State Capitol Building, Casa Bonita, the Denver Zoo, City Park, Confluence Park, and Empower Field at Mile High. It’s a tour through Denver like no other!
Race Options:
- Full Marathon (26.2 miles)
- Half Marathon (13.1 miles)
- Urban 10 Miler
- Marathon Relay (teams of 5)
- 5K
Where: City Park (starting line), Denver, CO
When: May 17th–18th
Register: runcolfax.org
May 31st – June 1st, 2025
Spartan Trifecta Weekend – Fort Carson, CO
Just south of Denver, this two-day endurance event at Fort Carson pushes athletes to their limits. Set against the dramatic backdrop of Pikes Peak and the Rocky Mountain foothills, the Colorado Springs Spartan Trifecta offers four race distances, each loaded with steep climbs, dirt trails, and signature Spartan obstacles.
Hosted on an active military base, this event is part of the Spartan Honor Series. You’ll race alongside military members and first responders and have the opportunity to earn a limited-edition commemorative medal.
Race Options:
- Sprint – 5K
20 obstacles
Quick and intense, ideal for first-timers
Date: Saturday, May 31st - Super – 10K
25 obstacles
A mid-range test of strength and stamina
Date: Sunday, June 1st - Beast – 21K
30 obstacles
A grueling half-marathon distance over rugged terrain
Date: Saturday, May 31st - Ultra – 50K
60 obstacles
For experienced athletes ready to take on the longest, toughest Spartan race
Date: Saturday, May 31st - Kids Race – 1K–3K
Age-appropriate course with scaled obstacles for young racers
Dates: Saturday and Sunday
For all of our RMFLEX members: We will be forming a team to participate alongside trainer Noah Moon on Saturday, May 31st. Make sure you follow our social media and read our upcoming newsletter to learn more about which Spartan Race we will be participating in, plus we will be sending out a member-only discount for participants.
Want the full challenge?
Purchase a Trifecta Pass to complete the Sprint, Super, and Beast over the weekend and save on registration.
Where: Fort Carson Army Base, 2700 Wilderness Road (Gate 6), Colorado Springs, CO
When: May 31st – June 1st, 2025
Register: Spartan Trifecta Weekend
**For those who can’t make the Colorado Springs Spartan Race with us, check out this schedule to participate in another Spartan around the US. The member-only discount code we will send out in our newsletter can also be applied to all Spartan Races in the United States (Kids, Sprint, Stadion, Super, Beast, Trail 10K, Trail 15K, and Trail Half Marathon). Click here to find a race.
Saturday, June 7th, 2025
Free Murph Challenge Workout at Rocky Mountain Flex in Denver
Join us at Rocky Mountain Flex for a morning of fitness, friends, and recovery. We’ll be taking on the Murph Challenge, a workout named in honor of Navy Lieutenant Michael Murphy, who was killed in action in 2005. Traditionally done on Memorial Day but we are hosting this unofficial challenge the first Saturday in June. Join us for this full-body test of endurance and strength.
Murph Workout Format:
- 1 mile run
- 100 pull-ups
- 200 push-ups
- 300 air squats
- 1 mile run
Most people use this format:
- 20 rounds of:
- 5 pull-ups
- 10 push-ups
- 15 squats
New to Murph? No problem. This workout is easily modified:
- Pull-ups can be swapped for ring rows or banded variations
- Push-ups can be done on knees
- Run/walk options encouraged
All fitness levels are welcome — just show up and bring your grit.
Where: Rocky Mountain Flex Fitness, 900 W 1st Ave #150, Denver, CO 80223
When: Saturday, June 7th | 8:00 AM
Register: No registration is required, Cost is free for members or non-members can purchase a gym day pass
Post-workout: Stick around for recovery time in On the Glo Sauna’s mobile wood-burning sauna located just outside of Rocky Mountain Flex. The fee to use the sauna is $15. They will be in the parking lot from 7AM to 1PM.
Saturday, June 14th, 2025
Colorado DEKA FIT Roadshow in Superior
If you’re ready for a new kind of fitness challenge, the Colorado DEKA FIT Roadshow should be on your calendar. It’s located in Superior CO in the Blue Sports Stable Fieldhouse. DEKA FIT is an indoor fitness competition made up of 10 functional fitness zones — with a 500-meter run before each one. It’s a total 5K effort combining cardio and strength, and it’s designed for all fitness levels.
Details:
- Each zone is preceded by a 500-meter run (5K total)
- The score is based on the total completion time
- Participants have the opportunity to receive a finisher shirt, medal, Trifecta Wedge, and official DEKA Mark
- DEKA FIT Marks from this Roadshow will be added to the Global Leaderboard which means you can also qualify at this event for the 2025 DEKA World Championships!
Where: Blue Sports Stable, 1 Superior Dr, Superior, CO
When: Saturday, June 14th
Register: Spartan DEKA FIT Roadshow
Want more race day action? Here are some great running events happening throughout Colorado.
There are even more races happening nearby this season, with options all around the Denver Metro Area and beyond. If you want to run, sign up early—many of these fill up fast, especially during the popular summer weekends. You can find even more local running events here.
- Colorado 13er, 10K, and 5K – Louisville, CO
June 1st, 2025 – Sunday
Trail race | 5K, 10K, Half Marathon - All-Out Summer Breeze – Arvada, CO
June 7th, 2025 – Saturday
Trail race | 5K, 10K, Half Marathon - Summer Vibes Bike Rally & Run Fest – Lyons, CO
June 21st, 2025 – Saturday
Trail race | 5K, 10K - High Line Canal Summer Scamper – Denver, CO
June 25th, 2025 – Wednesday
Trail race | 5K, 10K - Summer Splash Prairie Dog Half Marathon, 10K and 5K – Castle Rock, CO
July 19th, 2025 – Saturday
Road race | 5K, 10K, Half Marathon - Summer Sizzler – Thornton, CO
August 16th, 2025 – Saturday
Road race | 1 Mile, 5K, 10K, 15K - Boulder Sunset Run – Boulder, CO
August 23rd, 2025 – Saturday
Trail race | 5K, 10K - Labor Day Run 5K, 10K, and 13.1 – Aurora, CO
August 30th, 2025 – Saturday
Road race | 1 Mile, 5K, 10K, Half Marathon, Fun Run - Labor Day Half Marathon, 10K, and 5K – Parker, CO
September 1st, 2025 – Monday
Road race | 5K, 10K, Half Marathon
Get Moving This Summer!
Spring is the perfect time to step outside your comfort zone, set some new goals, and try one of these local events. Denver’s 2025 fitness events offer something for everyone, whether you want to take on a marathon, try out a new style of training like the Murph Challenge, or just meet other active people. And don’t forget, if you want to join us for the May 31st, 2025, Spartan Race in Colorado Springs, we will be announcing details along with a discount code for our members, so be on the lookout for our newsletter. We hope to see you there!
Spring Promotion: Now is the time to join! We are waiving our sign-up fee from April 15th to May 15th. On May 16th, the membership fee increases to $45, so don’t miss out! Join here or sign up in person!
