What does this trainer actually claim?
Kim Schaper argues that women can't build muscle using traditional training approaches and blames three factors for gym-goers who gain weight instead of muscle over years. She points to overtraining causing elevated estrogen and cortisol, chronic overeating paired with cardio-heavy routines, and insufficient resistance training intensity.
Her post suggests these patterns prevent fat loss and muscle gain while contributing to what appears to be midsection weight gain (her caption cuts off at "muf" but likely refers to "muffin top").
Does overtraining actually jack up estrogen and cortisol?
The cortisol part has some merit, but the estrogen claim is backwards. Overtraining syndrome does increase cortisol levels, as shown in studies of endurance athletes (Meeusen et al., Sports Medicine, 2013). However, excessive training typically decreases estrogen production, not increases it.
The Study of Women's Health Across the Nation found that high-volume exercise often leads to menstrual irregularities and reduced estrogen (Sternfeld et al., Medicine & Science in Sports & Exercise, 2012). Female athletes frequently experience hypothalamic amenorrhea precisely because intense training suppresses estrogen.
Schaper got the stress hormone piece right but completely misunderstood how exercise affects female sex hormones.
Is she right about lifting heavy and time under tension?
This is where Schaper's advice actually matches research. The American College of Sports Medicine recommends 65-85% of one-rep max for muscle hypertrophy, which qualifies as "heavy" lifting. Meta-analyses consistently show that progressive overload with challenging weights drives muscle protein synthesis better than light resistance work.
Time under tension also matters. Burd et al. (Journal of Physiology, 2012) demonstrated that slower, controlled movements with adequate load produce greater muscle growth than quick, light repetitions. Women can absolutely build substantial muscle mass when training with sufficient intensity.
The idea that women "can't train like a dude" to build muscle is nonsense. The same mechanical tension principles apply regardless of sex.
What about the overeating and cardio combination?
Schaper identifies a real pattern here, though her explanation is incomplete. Many people do fall into the trap of eating more calories than they burn through cardio, leading to gradual weight gain despite consistent gym attendance.
The problem isn't cardio itself but energy balance. A systematic review by Donnelly et al. (Journal of the American Medical Association, 2009) found that exercise without dietary control produces minimal weight loss because people often compensate by eating more.
However, combining resistance training with modest calorie restriction consistently produces better body composition changes than cardio alone. Schaper's underlying point about training approach is sound, even if she oversimplifies the mechanism.
What should women actually know about building muscle?
Women build muscle through the same basic principles as men: progressive overload, adequate protein intake (around 1.6-2.2g per kg bodyweight), and sufficient recovery. The main difference is that women typically build muscle more slowly due to lower testosterone levels.
A study by Abe et al. (European Journal of Applied Physiology, 2000) showed women can increase muscle mass by 20-25% over 20 weeks with proper resistance training. That's substantial growth by any measure.
The "train like a dude" comment reveals outdated thinking about female exercise capacity. Women benefit from the same heavy, compound movements that work for men, just with appropriate starting weights and progression rates.