How many calories do you burn in a day?
It’s one of the most common questions in fitness, but the answer is never as simple as a single number.
In a recent recording, Tia Toomey tracked her calorie burn throughout a particularly active training day using her Whoop device—and the results were eye-opening.
From chasing toddlers to back-to-back training sessions, her total daily energy expenditure (TDEE) revealed how workouts, parenting, recovery, and rest all influence the final count.
Here’s a breakdown of what we can learn about calorie expenditure, strain, and performance from her full day in motion—plus helpful takeaways for anyone looking to understand or optimize their own TDEE.
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Calorie Burn: It’s More Than Just Exercise
The athlete started her day with a surprising 750 calories already burned.
This wasn’t from formal training—but from morning routines, chasing her daughter Willow, and simply going about her day.
“That could have been just an average Friday,” she remarked, showing how non-exercise activity thermogenesis (NEAT) can make up a major portion of daily calorie burn.
NEAT includes all the unstructured movement we do: walking, cleaning, fidgeting, and, in this case, the highly underrated cardio workout of parenting.
Activity Levels Can Surprise You
One surprising insight came when she compared active recovery days to intense workout days.
She noted that her Thursday “recovery” day showed a total burn of 2,100 calories—despite doing less targeted training than on Tuesday and Wednesday.
“That was crazy,” she said, illustrating how duration of movement, even if lower in intensity, can drive overall calorie output.
Daily totals varied dramatically depending on lifestyle factors, movement patterns, and how much of the day was spent on her feet.
Training Blocks and Their Impact
Throughout the day, she went through several structured workout sessions, including rowing pieces and accessory work with minimal rest between segments.
During one rowing interval, she burned about 400 calories.
A heart rate spike to 183 bpm underscored the effort, as did a registered Whoop strain of 12.3.
“It felt like 20,” she admitted, referencing how perceived exertion can vastly differ from the data.
By midday, her calorie tally was at 1,700–1,750, with still more left to do.
After adding another training piece including kettlebells and higher-effort movements, she estimated burning an additional 500 calories.
That brought her close to 2,250 calories for the day—and it wasn’t even evening.
Sleep, Recovery, and Readiness Matter Too
While calorie tracking sheds light on output, readiness metrics offer crucial insight into the body’s ability to handle that output.
She noted her average resting heart rate was 48 beats per minute and dipped as low as 44 leading up to CrossFit competition season.
Her heart rate variability (HRV) was measured at 68—solidly in the healthy “green” zone above 58, according to Whoop standards.
“I’m pretty happy with that,” she said, reinforcing the importance of recovery markers over raw calorie count.
Interestingly, when she was sick the previous week, her body communicated it early through metrics.
- Her skin temperature spiked before symptoms began
- Her respiratory rate climbed shortly after
- HRV dropped significantly
This pattern of data not only confirmed her illness, it also emphasized how fitness wearables can flag issues even before symptoms hit.
Parenting Adds Unexpected Activity
Beyond prescribed workouts, she cited another major contributor to calorie burn—her daughter, Willow.
“Willow does a lot of steps,” she explained, half-joking that chasing after a toddler had a serious cardio impact.
Her grandmother used to say, “The more active you are during pregnancy, the more active they’ll be,” a prediction that turned out to be impressively accurate.
The constant physical engagement with her child added unplanned but significant movement throughout the day, underscoring yet again how important NEAT is in total energy expenditure.
Lessons for Tracking Your Own TDEE
While the day was unique to her life as an elite athlete and parent, many of the lessons can translate to anyone with fitness goals.
1. Use wearables for data, not judgment
Tools like Whoop, Oura Ring, or Garmin can give valuable insights on output, recovery, and strain—but they aren’t the whole picture. Use them as guides, not verdicts.
2. Count all movements
Calories burned isn’t limited to workout time. Household chores, standing, walking, even caring for your kids contribute meaningfully to your TDEE.
3. Monitor recovery as closely as output
HRV, resting heart rate, sleep quality, and skin temperature are tools worth tracking. Consistency in those metrics can influence how well you train and how quickly you bounce back.
4. Eat to support output
She mentioned eating lunch before one particularly intense session helped maximize performance. Fueling around demanding sessions ensures recovery and reduces injury risk.
The Bottom Line
On this single day, her estimated calorie burn hovered around 2,750 to 3,000+ calories, combining workouts, parenting, and recovery support.
It’s a powerful reminder that calorie burn is dynamic—shaped by not only how you train, but how you live.
Whether you’re an athlete, parent, or both, don’t underestimate the energy demands of your day-to-day activity.
And when tracking performance, remember: what counts isn’t just what you burn—but how well your body handles it, adapts to it, and bounces back stronger.
