In your govt registered retirement funds you won't be able to leverage your funds whether it be with margin or with options.
Now this is a good thing and I'm probably going to regret telling you this, but there is a way around it. Recently these financial instruments called ETF (exchange traded fund) have multiplied into an array of indexes and also leveraged ETFs. A leveraged ETF is when a fund usually uses options to exaggerate the effect of an index so that it either moves up or down 2 to 3x the normal movement.
This also allows you short indexes if you think the market is too high and want to profit if the market goes down. I really don't recommend you use any of these instruments unless you're highly skilled in this area. If you do you won't just get burned, you'll get burned 2-3x the amount!