“What are the restrictions after open heart surgery?”

Generally, you are restricted in lifting more than 10-15 lbs for the first 6 weeks until the breastbone heals. No driving on narcotic pain meds. Walking and leg elevation when in bed are good. A lot of people have extra fluid weight after heart surgery so you may be on a fluid pill (diuretic). The start of "cardiac rehab" depends on your heart status and needs to be per your heart surgeon and cardiologist.

General care, Diet, proper exercise should be observed. Heavy weight lifting be avoided.