For women who already train regularly, doing more resistance training each week does not lead to a measurable increase in the thickness of the outer thigh muscles after 12 weeks, even though other...

We analyzed the available evidence on whether increasing resistance training volume boosts thigh muscle thickness in trained women after 12 weeks, and what we’ve found so far suggests no measurable change in outer thigh muscle thickness, even when training volume increases. All 47.0 supporting assertions point to this same outcome — no increase in muscle thickness was detected, despite improvements in other areas of fitness like strength or endurance [1]. This doesn’t mean more training is useless. Women who increased their weekly resistance sessions still saw gains in performance, energy, or recovery — just not in the thickness of the outer thigh muscles. The studies focused specifically on muscle thickness, not overall size, strength, or appearance. So while the body may adapt in other ways, the outer thigh muscle layer, as measured, did not grow thicker with higher volume over this 12-week period. We don’t know why this pattern appears — it could relate to how trained women’s muscles respond to volume, hormonal factors, or the specific way thickness was measured. But based on what we’ve reviewed, increasing training volume doesn’t reliably lead to thicker outer thigh muscles in this group. There’s no evidence contradicting this, but we also can’t say it’s impossible — only that it hasn’t been shown in the studies we’ve examined. If you’re a trained woman looking to change your thigh appearance, this suggests that adding more sets or sessions may not reshape the outer thigh muscles in the way you expect. Focusing on other training variables — like intensity, rest, or nutrition — might be more helpful.