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Cardio exercise is advisable and needed to strengthen the body such as walking riding a bicycle even jogging tai chi .... no heavy weight training the strain could cause you to burst your aneurysm ... a brisk 2 mile walk daily
keeping the blood pressure as low as possible is required , If your Pre operative and "being watched" Spiking the blood pressure could cause a rupture... slowly bringing the bp up such as warming up walking and cooling down after is what your looking for ....
any straining such as heavy weights could cause a rupture and subsequent bleed (even straining in the bathroom!!)