ForumResults & Progress

Dumb Question about Tirz

8 replies8 peopleMay 27, 2026☆ Follow
Summary

Why do legs get stronger on tirzepatide while arms stay weak during weight loss?

Women on tirz report uneven strength gains, with legs responding faster due to baseline differences in muscle mass and daily use. Training consistency, protein intake, and heavier loads are discussed as ways to support upper body progress, though calorie deficits complicate muscle growth. Personal experiences vary widely based on prior athletic history and health conditions.

What this discussion establishesWhere people disagree

Whether selective upper-body muscle loss is common or mainly tied to individual factors like disease.

Still open

How much protein or specific supplements are truly needed to reverse arm weakness on tirz.

Nothing here is advice.

8 replies · 8 people
LevelSignal57archiveopening postMay 27

I keep hearing that tirz leads to big muscle loss unless you eat tons of protein and lift. I want to get stronger instead. My legs have improved a lot on the leg press, but my biceps have not moved at all. I do full body weights twice a week plus yoga and running. My legs look more defined while my arms still look skinny. Could I be dropping muscle only upstairs? I'm 35, 5'4", started at 240 now 210, on tirz since 3/9/26.

PlainCompass54archiveMay 27

I came across some online explanation claiming it's tougher overall for females to build up arm power versus leg power. The main reasons involve starting out with far less upper-body muscle tissue plus distinct patterns in how the nerves trigger contractions there. Legs begin closer to male levels in raw power output, while arms lag further behind from the outset. Everyday activities keep the lower limbs active through basic movement and supporting body weight, which builds extra staying power over time. Arms tend to handle only lighter precision work instead. Muscle makeup also plays a role, with more endurance-oriented fibers showing up in the legs to help generate force more readily. On top of that, the shoulders, back, chest, and arms simply hold less tissue to work from, so visible changes require steady increases in demand.

PlainCompass54archiveMay 27

That's actually a reasonable thing to wonder about. A ton of the fitness knowledge passed down to us comes from research that only included male participants, which means a bunch of those recommendations just don't line up with how female bodies respond.

RustLantern55archiveMay 27

It seems typical for most women, which can feel annoying at times even though powerful legs bring real advantages. Your progress stands out to me. Back in my teens and early twenties while competing in sports I carried a lot of strength overall, even in my arms and shoulders, managing multiple repetitions on arm curls with thirty five pounds, pressing one forty on the bench, and completing pull ups despite weighing one sixty five. Then roughly a decade ago severe autoimmune flares forced me to quit nearly every activity and training session, leaving me far less capable than before. Rebuilding anything close to an above average upper body feels like it will take real effort if I ever try again. Almost everyone I trained alongside developed strength in the same pattern you mentioned, aside from a handful of unusually gifted teammates. I intend to keep showing up for arm and shoulder sessions to hold onto what I have and occasionally push heavier loads for just a few repetitions before dropping back to something easier.

BlueTimber11archiveMay 27

Using bigger loads on lifts isn't automatically the same as adding muscle, folks mix those concepts up all the time. It gets even tougher when cutting calories since that really slows down any muscle building.

AmberFenwick97archiveMay 27
↳ replying to @LevelSignal57 (opening post)

Yeah I've dealt with that situation before. Stuff like this occurs. Consuming ample protein plus creatine and maintaining proper diet is key because muscles need feeding to develop properly. Personally NAD+ along with Lipo-C and B12 has aided me. Also steak eggs plus complex carbs help. Lacking appetite makes it difficult yet effort is required. Lifting heavier loads works when growth stops. Pushing resistance workouts to total exhaustion allows me to grow. Stay persistent.

SlowSignal40archiveMay 27

When hitting the smaller muscles up top my approach shifts. Aiming to build stronger biceps I run six groups of three lifts then two groups of five. The opening six groups sit at eighty five percent of my single rep ceiling while the closing pair drop to seventy percent yet feature a fast upward drive and drawn out lowering. I also keep four minutes or longer between groups and draw long deep slow breaths in those pauses.

IronLantern24archiveMay 27

Yeah that question is pretty good. During my younger days I managed three hundred pounds using my legs but failed to bench press even fifty pounds.

PatientSparrow76archiveMay 27
↳ replying to @LevelSignal57 (opening post)

My torso area gives me trouble as well. Fat disappears quicker from there yet a condition affects that spot making things unlike your situation. Which methods did you use to build more muscle? Adding smaller amounts of weight, keeping muscles strained longer, or doing more repetitions? Doing curls on a bench just for laughs?

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