I've see ladies contrive to lean back doing the weaver!
No easy task!
Seriously to the O.P. intentionally lean forwards, really make a big deal out of it. The only way I got Mrs WP to not lean back was to slip an 18" ruler into the back of her waistband sticking up her back, so she could feel it every time she started to do it!
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Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”