Does resistance training actually change your body?

In a 12-week study of breast cancer survivors, resistance training combined with 10,000 steps didn't significantly alter muscle or fat mass compared to walking alone.

Test your knowledge

A woman who survived breast cancer and underwent chemotherapy is looking to improve her body composition (specifically her muscle and fat levels) through exercise. Based on the findings of this study, which of the following best describes the likely outcome of her participating in a 12-week program of strength training combined with daily walking?

A) She will see a significant increase in muscle mass and a decrease in body fat compared to just walking alone.
B) She will see no significant change in her body composition compared to just walking alone.
C) She will see a significant improvement in her body composition because strength training specifically reverses the damage caused by chemotherapy.
D) She will see a significant decrease in visceral fat, but only if she also undergoes hormone therapy.

🔬 The Breakdown

Context: However, for those who underwent chemotherapy, the intervention successfully prevented the significant increase in visceral fat and body fat percentage seen in the inactive group.

Reality Check: The study shows that while muscle growth wasn't immediate, the intervention acted as a vital buffer against the metabolic toll of intensive medical treatments.

Takeaway: Prioritize two sessions of resistance training a week alongside your daily movement to protect your metabolic health.

Published July 29, 2026

The science, explained

Evidence Check: This was a randomized controlled trial involving 60 women who survived breast cancer.

Conventional Wisdom Check: This study refines common beliefs by showing that while exercise is beneficial, a short 12-week program may not produce rapid, measurable changes in body fat or muscle for everyone.

Everyday Translation: For a survivor, this means that while the exercise program is a healthy habit, they shouldn't expect to see dramatic changes in their body shape or fat levels in just three months.

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