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I have included the website for Boston Scientific as this is the brand of pacemaker that our cardiologists use and is one of the most popular pacemakers used in many hospitals in US. Even if your pacemaker is a different brand, the concept and what you do after the insertion are similar. Good Luck with the procedure.
The other thing you can do (assuming you're at least minimally gymnastic) is roll over on to your tummy first, then hold on to the bed with your right arm and slide/swing your right leg out and onto the floor.
But I think on the whole by "straining" the people who write this kind of advice mean racquet sports and heavy lifting, rather than natural everyday movement (within reason). Ask your cardiology team for tips - dos and don'ts - if you're still worried.