3 pieces of advice across instagram, each one checked against the research. Sorted by reach — the claims their followers saw most, first. This is not a witch hunt: verdicts are about the evidence, never the people. Last reviewed: July 14, 2026.
2 holds up1 more nuanced
holds up18,098 likes · instagram
It is entirely possible to combine strength training and running without losing muscle mass, provided you design an adapted program, manage training intensity well, and adjust your nutrition.
The idea of reconciling strength and endurance without sacrificing muscle mass is based on solid scientific foundations, a concept often studied under the name of concurrent training. A major meta-analysis by Schumann et al., published in 2022 in the journal Sports Medicine, confirms that endurance training does not compromise muscle volume gain when programmed correctly. The data show that the risk of interference between the two disciplines depends primarily on the volume and frequency of running. Randomized controlled trials (RCTs) suggest that spacing running and strength training sessions by at least 6 to 24 hours allows for maximizing recovery and muscular adaptations. Finally, the nutritional aspect mentioned by the creator is validated by research: an sufficient intake of protein and calories is essential to compensate for the energy expenditure of running and to preserve muscle tissue. Nassim's advice is therefore very robust and perfectly aligned with modern exercise science.
To tolerate a high training volume (running and strength training) without injury, you must increase the load very gradually and systematically consume electrolyte supplements during every running session, depending on the distance.
The recommendation to progress slowly to avoid overtraining is based on very solid scientific foundations. A systematic review by Windt and Gabbett (2017) shows that managing workload progressively effectively protects the body against fatigue-related injuries. However, the systematic use of electrolyte supplements for every workout merits a more nuanced view. According to the guidelines of the American College of Sports Medicine (ACSM, Thomas et al., 2016), mineral intake is primarily useful for endurance efforts lasting longer than one hour or during intense heat causing significant sweating. For shorter sessions or in cool weather, water alone is generally sufficient for optimal hydration, making the daily use of these supplements somewhat overstated.
Combining strength training and cardiovascular training (such as running) is a complementary and beneficial approach, as neglecting cardio is a mistake for overall physical fitness.
The idea of combining cardio and strength training, known as concurrent training, is widely supported by modern sports science. For runners, a meta-analysis by Balsalobre-Fernández et al. (2016) demonstrates that muscle strengthening improves running economy and prevents injuries. For strength enthusiasts, another meta-analysis conducted by Schumann et al. (2022) shows that adding cardio does not compromise muscle development or strength, provided that sufficient recovery time is respected between sessions. Cardio also improves the capacity for active recovery between sets of heavy exercises. Although a slight interference effect may exist for elite-level athletes seeking the extreme limit, this synergy is perfectly validated and highly recommended for the general fitness practitioner.
