If you're looking to burn fat and transform your body, the answer doesn't lie in more cardio. Resistance training is where it's at!
We hear the word "tone" all the time when people state their goals. The tone is MUSCLE. And a body with more muscle burns more fat at rest.
You can read study upon study about this fact, but I also have a little personal experimentation to share with you about cardio vs. strength training workouts.
I wear a heart rate monitor during my workouts and it also tracks calorie burn. Note that wearables shouldn't be relied upon for the accuracy of calories burned - our bodies are more complicated than that. However, it's a metric you can look at for personal trends. Popular fitness programs have capitalized on people's dependence on wearables and, I believe, grossly overstate calorie burn and the " afterburn."
During the shutdown of the gym, I tracked calories burned during a variety of workouts, including straight aerobic and straight strength work. Let's look at both of those workouts performed in the same time domain.
For the cardio workout, I ran for 30 minutes straight at an aerobic pace. Calories burned were 320. And I wasn't building (or even working to maintain) muscle.
For strength training workouts, I did 30 sets of 1 trap bar deadlift, 1 strict press, and 1 seal row, all at 80% of my max. The workout also took 30 minutes and burned 550 calories. In this workout, I was working to build muscle.
So here are some takeaways:
Hopefully I've shed a little light for all you cardio junkies that think adding more aerobic work is the key. Remember: resistance training and a sound diet with plenty of protein are the way to go (and grow!).