Evidence-based programming informed by peer-reviewed research. Last updated: April 19, 2026.

The scale is moving. Your body looks different. Not in the way you expected.

"I actually feel less firm, more wobbly and flabby. I seem to have less definition." — voiced in r/GLP1 community discussions, 2026

That isn't vanity. Up to 39 percent of the weight you lose on a GLP-1 is lean mass (Prado et al., 2024). Most apps don't know you're on a GLP-1 and can't adapt. Salerna does.

What other apps get wrong about GLP-1 training

Zero apps have a GLP-1 mode. You're just another weight-loss user as far as their programming is concerned, even though your physiology is meaningfully different.

They optimize for calorie burn, not muscle retention. The scale is already moving for you — the problem is the composition of what's leaving, and chronic cardio is the wrong lever.

They program for steady-state weekly intensity. Injection day plus the 24 to 48 hours after often come with nausea, fatigue, and reduced appetite. A generic HIIT block on injection day is a bad prescription.

How Salerna programs for GLP-1 users

1. Muscle preservation is the primary goal. Resistance training plus adequate protein is the evidence-based intervention — in a meta-analysis of RCTs, resistance training attenuated 93.5 percent of caloric-restriction-induced lean-mass loss (Sardeli et al., 2018). Salerna biases GLP-1 users toward 3 to 4 lifting sessions per week with progressive loading.

2. Progressive resistance with tracked strength as the outcome. The engine tracks your main compound lifts week over week. If strength is holding or improving while weight drops, you're winning. If strength is falling, that's a signal that protein, sleep, or volume needs adjustment.

3. Injection-day scaling, automatically. Tell Salerna when you inject. Injection day and the day after default to shorter sessions, reduced volume, and no HIIT. Full programming resumes on day 3.

4. Protein-intake coaching alongside training. Resistance training without adequate protein intake is still net catabolic during a caloric deficit (Cava et al., 2017). Salerna's coaching includes protein-intake guidance calibrated to your body weight and training load.

5. Zone 2 cardio, not chronic HIIT. During a pharmacologic deficit, stacked HIIT adds stress without proportional benefit. Zone 2 steady-state cardio supports cardiovascular health while protecting recovery.

6. Daily readiness-aware volume. If your check-in flags nausea, low sleep, or low appetite, the engine scales volume down and prioritizes movement quality.

Frequently Asked Questions

Am I losing muscle on a GLP-1?

Likely yes, at least in part, without a resistance-training stimulus — 25 to 39 percent of the weight lost on a GLP-1 can come off as lean mass (Prado et al., 2024). Resistance training plus adequate protein is the evidence-based response (Locatelli et al., 2024).

How should I train on injection day?

Lighter. Salerna defaults to shorter sessions with reduced volume and no HIIT on injection day and the day after. Full programming resumes on day 3.

What if I feel too nauseous to work out at all?

Walking counts. Even 20 to 30 minutes of walking on your worst day maintains the "I'm still training" signal. Don't force a lifting session through active nausea.

Should I stop cardio entirely?

No. Zone 2 steady-state cardio supports cardiovascular health during a deficit without the recovery cost of chronic HIIT. 1 to 3 zone 2 sessions per week is the sweet spot.

Will strength training slow my weight loss?

No. The Villareal 2017 NEJM RCT showed resistance plus aerobic training during weight loss produced equivalent fat loss to aerobic-only while preserving more lean mass and functional capacity.

Salerna is a training platform and provides educational information. It is not a substitute for medical advice. Consult your prescribing clinician or a registered dietitian regarding your individual health circumstances.