Strength Training While Losing Weight

When you lose weight, you lose some muscle along with fat. Strength training is one of the most reliable ways to keep that muscle. This matters for everyone, and it gets extra attention for people on GLP-1 medications, where weight can come off faster.

Key takeaways

• CDC guidelines call for muscle-strengthening activity at least 2 days a week, working all major muscle groups, plus 150 minutes of moderate aerobic activity.
• Experts note that protein alone is likely not enough to protect muscle during weight loss. Resistance training is the other key piece.
• You can start with body weight, bands or light dumbbells at home.
• Focus on good form and slow progress, not heavy weights.
• Check with your clinician first if you have heart, joint or balance concerns.

Why muscle matters during weight loss

Muscle does a lot more than help you lift things. It supports:

• Strength and daily function, like climbing stairs and carrying groceries
• Balance, which lowers fall risk as you age
• Blood sugar control, since muscle uses glucose
• Bone health, because loading your bones helps keep them strong

A 2025 joint advisory from four nutrition and obesity medicine groups on GLP-1 therapy recommended including resistance training and noted that protein alone is probably not enough to preserve muscle without it. It also suggested referral to an exercise physiologist or physical therapist where appropriate. Read more in GLP-1s and muscle loss.

What the guidelines say

"All major muscle groups" means legs, hips, back, abdomen, chest, shoulders and arms. You don't need to do everything in one session.

A simple beginner plan

This is a general example for healthy adults, not a personal prescription. Start lighter than you think you need.

Two or three days a week, with a rest day between:

1. Squat to a chair (sit down and stand up with control)
2. Wall or counter push-ups
3. Band or dumbbell rows
4. Glute bridges
5. Step-ups on a low, stable step
6. Overhead press with light dumbbells or a band
7. Plank on knees or toes

Start with 1 to 2 sets of 8 to 12 repetitions of each, at an effort where the last couple of reps feel challenging but your form stays clean. Rest a minute or so between sets.

How to progress

When an exercise feels easy for 12 good reps, make it a little harder:

• Add a few more reps or one more set
• Use a slightly heavier weight or stronger band
• Slow down the lowering part of the movement

Small steps each week add up. A physical therapist or certified trainer can check your form if you're unsure.

Pairing training with nutrition

Strength training and protein work together. Many people on GLP-1s eat less, so it helps to:

• Aim for enough protein spread across the day. See how much protein do you need on a GLP-1.
• Eat something small an hour or two before a workout if you feel shaky training on an empty stomach.
• Hydrate before and after, especially if you have nausea or diarrhea. See hydration on GLP-1 medications.
• Get enough sleep, which affects recovery and appetite.

Track more than the scale

When you strength train, the scale doesn't tell the whole story. Try tracking:

• The weights or reps you can do
• Waist measurement and how clothes fit
• Energy and how easy daily tasks feel
• Body composition, if you have access to a reliable measurement

You can log workouts, weight and measurements in the PepSteady app.

Safety tips

• Get cleared first if you have heart disease, uncontrolled blood pressure, recent surgery, or joint problems.
• Stop if you feel chest pain, severe shortness of breath, or dizziness, and seek care.
• Warm up for 5 minutes with walking or easy movement.
• Expect some soreness a day or two after new exercises. Sharp pain is a signal to stop.
• Be extra careful with balance if you've had dizziness from low food or fluid intake.

Sample week

Here's one way a beginner might lay out a week. Adjust it to your schedule and energy.

That covers two strength days and about 150 minutes of moderate activity, which matches the CDC guideline. On days you feel queasy or tired, a short walk still counts.

The bottom line

Strength training at least twice a week, along with enough protein, is one of the best ways to protect muscle while you lose weight. Start simple, focus on form and build slowly. Check in with your clinician if you have health conditions, and consider a physical therapist or trainer for a personal plan.

Sources

• CDC: Adult activity, an overview
• Nutritional priorities to support GLP-1 therapy for obesity: A joint advisory (2025), PMC
• The Obesity Society: Nutritional priorities to support GLP-1 therapy

Frequently asked questions