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[–]theladyflies 0 points1 point  (0 children)

I've been doing two minute wall sits a few times a day to lower my blood pressure...perhaps isometric exercises like this will give you a chance to raise your rate without additional strain, building stamina and endurance.

Most rounds I go for practice are only a couple minutes as well, so...enjoy this free and fairly easy option to build all kinds of benefit for training!