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1. The Frosty Growler
2. What Really Happens to Your Heart During a Marathon
3. Sudbury Rocks Running Club - Group Runs
4. Photos This Week,
5. Upcoming Events: May 24 2026 SudburyRocks!!!

The Frosty Growler Triathlon is back for 2026 & bringing the heat to winter with a one-of-a-kind challenge that mixes skiing, biking, and running into one epic race.
Whether you’re racing solo or as a team, The Frosty Growler is all about getting outside and embracing winter! And.. this year, we have short and long course options!
Date: Sunday, March 8
Location: Kivi Park
CANCELLED!

Staring down the barrel of a marathon starting line can make your heart thump harder than a flat tire on the highway – and that’s before you even start moving. There’s no doubt racing puts a lot of wear on your cardiovascular system, so is it really safe? To answer that, check out this new story from Outside: "What Really Happens to Your Heart During a Marathon." Racing causes your heart rate and blood volume per beat to increase, raising total cardiac output by up to eight times your resting levels. As the miles accumulate, cardiovascular drift kicks in, meaning your heart rate tends to climb upward to keep up with the physical demand. One finding that surprises many runners is that troponin – a cardiac enzyme typically associated with heart attacks – can leak into the bloodstream during a marathon. A recent JAMA Cardiology study found that while elevated troponin levels are common post-race, the heart generally recovers within days, and long-term cardiac dysfunction is not the expected outcome for most runners. As Dr. Eamon Duffy puts it, for the vast majority of runners, marathon running is safe and good for cardiac health. That said, it's worth discussing your specific situation with a doctor before ramping up your training. Once you have that green light, understanding your heart rate zones can help you train smarter. This story from Polar is a solid place to start: "Heart Rate When Running: What is Normal?" Physical therapist Jason Lakritz suggests that most runners can simplify their training to three systems: aerobic (zones 1–2), lactic threshold (zone 3), and anaerobic (zones 4–5). A quick rule of thumb for gauging which zone you're in without a monitor: if you can speak in full sentences, you're likely in the aerobic zone; four or five words puts you near lactic threshold; one or two words means you're going anaerobic.

    Wednesdays - meet at Apex Warrior parking lot departing at 1800h. Typically runs are 1 hour or 10km.
                    Saturdays - meet at Bell Park's Elizabeth St parking lot departing at 0800h. Typically runs are longer at 1.5 hours or 15km minimum.

Generally the pace floats between 5 and 7 minutes per km. Anticipate a mixture of roads and trail running on the routes.
Inclement weather is usually just a challenge. Group has only been cancelled for local races or xmas. Cancellations or changes in meeting locations will be posted.

Locations are show in the attached photos/maps.

Wednesday pm location

Saturday am location

May 24, 2026

SudburyRocks Race, Run or Walk