To not stop this activity even though school asked me to?

Sounds like the school are trying to work with parents which is a good thing. I think you shouldn't stop the yoga like activity it's important for her pain management.
However I would want to know why she is picking up detentions. Some detention is hard to avoid, it's an odds game, everyone is late sometimes , everyone will forget their homework once.
No student likes detention, help her remove the cause.

I have never imposed additional sanction an any of my DC.

Yes I support the school in their sanctions, and would talk to DC about what they'd done, why it was wrong etc. But not a chance I'd add further punishment.

After all, does school isolate pupils from friends when they're grounded for a week for misbehaviour at home? No, thought not

Oh goodness, I just saw your update saying what the detentions are for! I wouldn’t be supporting them at all, that is WILD. Are schools genuinely like this?!

A ridiculous over reaction for very minor issues. The school sounds absolutely bat shit.

The fuck would I be taking her outside activities away for these minor slip ups and I'm absolutely appalled that her tutor thinks this is appropriate. As for suggesting that she isn't allowed to go to something that has positive effects on a medical condition... words fail me.

Please do not stop any of her out of school activities, and I say that as a Year 5 teacher! I have never heard a school insisting on this ….. it’s madness. Also, take her to the cafe after yoga. X

In year five?! Fuck no. I wouldn’t be leaving my child in that school either.

I get that schools want parents to back them up and it’s an issue when parents undermine school. But… firstly the detentions are way over the top for what she’s done, secondly the teacher should not be “urging you to rethink” and thirdly if yoga stops her being in pain then no bad behaviour in the world would make me take it away. I wouldn’t have taken away any other activities for anything less than bullying, racism, etc. I think you’re absolutely unreasonable for threatening to take her choir away for these ridiculous reasons.

None of the school's business what your DD does in her own time anyway. Certainly not appropriate to stop an activity which sounds like it has therapeutic benefits.

It really does. Dickensian.

This sounds OTT. Just tell the school that it’s a medical necessity. Presumably they wouldn’t even know about the ‘yoga’ unless you had told them?

The whole approach seems very controlling.
You DD didn’t meet expectations in school and has been given 3 detentions. If the school doesn’t think that is enough, they can take further action INSIDE school.

Is the school doing anything alongside the punishments to try and help your DD?

What the actual hell? What kind of school is this? I'd be moving school asap. This is beyond belief. Don't do any of the outside school punishments. Your poor child.

Can you move schools? She's Year 5 so 9 or 10. There's just no need for draconian rules/punishments. Having said that yr5 also seems young for a phone so maybe it's me 🤷‍♀️

Jesus, it sounds like a Borstal! I’d look at other schools. The poor kids must be nervous wrecks!

For those minor infractions I wouldn’t even stop the other two activities, let alone one that was medically necessary. Completely over the top and more likely to turn her off school than encourage a good attitude to learning.

I work closely with the school on my daughter’s behaviour and we back up school discipline, but for such small errors I wouldn’t be cancelling out of school activities.

I wouldn't be adjusting any out of school activities. Out of school activities are nothing to do with school, they are usually an enrichment, developing a skill, or developing fitness, all of which are important in producing a well rounded human. Don't pull her out of the choir concert as this is something she is working towards as part of a team. Certainly don't stop yoga - that's ridiculous.
She is getting a lot of detentions though for a 9yo, is there something going on?

This is so ridiculously over the top for a 9 year old. What on earth is the school thinking? Forgetting a pin etc. Seriously.

This school sounds awful!

Wow your poor kid, not being allowed to be a kid at all. Step up, she's done nothing wrong. Detention for having a drink, omg! Give her all her activities back, this is insane.

I would be removing her from that school. Punishing a 9 year old for forgetting a key or having a drink of water is absolutely ridiculous, and to expect you to further punish her out of school by stopping her doing activities which are of benefit to her learning and well being is cruel and completely goes against everything we know about discipline and child development. To ask you to do something which they already know will lead to physical pain is bordering on child abuse!

Given your updates I’d have refused to cancel a single activity and I’d not be pleased any of those detentions happened,

I cannot wait until the world catches up and these schools aren’t allowed to behave like this anymore.

I’d have to seriously consider moving schools.

This is quite insane (the school, not you!). The school have zero right to dictate how you and your child should lead your lives outside of school, or for them to try and drag you into their what appears to be ideologically punitive madness. A parent’s support of the school giving a detention should stretch to that and that alone, ie. respecting that the school have made an informed decision and not ordinarily questioning it. Keep the form tutor on side (because they are for sure just the messenger here) and let them know you’re escalating the policies to the leadership. Then tell them they have no right to overstep like this, and that you will manage your family’s arrangements as you see fit.

Your 9 year old is getting detention?! And you're considering further punishment at the behest of the teacher?
If I were you I'd be considering a different school.
Absolutely do not remove your 9 year old child from her activities.

Just tell her off and let her do her activities, with a warning about future behaviour.

Fuck that. I thought this was going to be abut violence or racism... something actually serious.

No phone and activities for forgetting a blinking house pin?

On your latest update, I’d let her do all her usual activities and return the phone. School is acting as a petty Hitler.