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Weight loss chat

A space to talk openly about weight loss journeys and challenges. Mumsnet hasn't checked the qualifications of anyone posting here. You may wish to speak to a medical professional before starting any diet.

Mounjaro arse

14 replies

SpringPuppie · 25/04/2026 11:43

I’ve lost 35lb on Mounjaro since the beginning of December.
I’ve got another stone to lose until I’m at my goal, currently have a bmi of 24…. So I’m not underweight, I’ve gone from a size 14/16 to 10/12. I’ve started going to the gym 3 times per week yet my arse looks ridiculous, flat and a bit old man/saggy. Apparently this is common and down to rapid fat lose and should sort itself out, has anyone else had the same problem, has it got better?

OP posts:
Disturbia81 · 25/04/2026 12:18

My arse is naturally flat when I’m slim but squats and weights sorted it! It’s rounder and firmer. Clothes are slightly tighter of course but it looks so much better

travailtotravel · 25/04/2026 12:20

Yeah this is a thing with age as well as weight loss - pancake bum! Rock your good health and fitness.

SuperSange · 25/04/2026 13:04

That can be helped at the gym.

RoseField1 · 25/04/2026 13:07

You need to build muscle. It's not easy, and you need to be eating enough to build some, but it can be done. You can improve the look of your bum by exercise even if you don't add a lot of new muscle.

TheChosenTwo · 25/04/2026 13:10

I’m doing a lot of reverse lunges and weighted thrusts at the gym to try and build mine back up as it’s exactly as you describe yours.
I’m fine about the shrunken boobs and the crepey belly skin but my bum was my best feature 😂

Gettingbysomehow · 25/04/2026 13:37

Ive gone from kim kardashian to sad flat old lady butt. I'm going to have to hit the gym big time. Yes you can change it but it will take time.

Mumof1andacat · 25/04/2026 13:45

Very common. Could you book in with a personal trainer to look at a routine to help build muscle in that area if you want more definition.

Lemonthyme · 25/04/2026 16:23

I was about to suggest you'd lost it a bit fast but then it's 5 months and so 7lb a month, that's <2lb a week. That's entirely reasonable. The advice though if you have this is always to lose weight more slowly. So I guess if you want to lose more, albeit you're now in "normal" perhaps slow a little?

I've not used MJ but my arse is fine in my 40s, albeit more weight to lose overall. I think probably because I do weights and run. I'm not sure of your age but exercising 3 days a week to keep fit is great but probably not enough to massively change your shape. I'd go for more if you can (5 days if possible). Doesn't have to be in the gym but using online workouts (e.g. FitnessBlender) and doesn't have to be high impact either. Or try couch to 5K. Running does great things for glutes and leg muscles and strength.

HeidiLite · 25/04/2026 16:31

Well your skin will shrink a bit sure, if you mean this by things sorting itself out. But to get a nice round backside when slim, you need to grow your glutes. For this, you need weights. Heavy and progressive overload, not random bodyweight squats. If you want to build muscle then cardio should not be your main exercise.

Mysticmaiden · 25/04/2026 20:40

I've been in maintenance for 5 weeks and must've had fat redistribution because ive stayed the same weight but my bum and breasts are rounder and seem bigger, so there is hope, even if you've not exercised yet.

SpringPuppie · 25/04/2026 21:12

Thanks all.. A lot of squats and weights for me then, I can do that.

OP posts:
GirlFromMontmartre · 25/04/2026 21:14

It’s going to depend on your eating, I am not sure how much you eat on the jabs, but you need lots of protein to build the muscle plus targeted training

WellConfusedandDazed · 25/04/2026 21:46

Yup. My ass looks like a deflated balloon. I am doing a lot of glute exercises and weight lifting to try and re-plump it. Even when I was younger and thin, I always had a big booty so it’s been a shock to me. On the other hand, I kind of like fitting into trousers properly which were always an issue as I with had too tight on my butt and thighs to fit my waist, or a gappy waist to fit my butt. 😂

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