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One of the reasons to sit on a preferbly firm cushion is to allow an eased sitting with knees relaxed and hips raised. Formal sitting is a great alignment to improved health, insight and calming.
My top tip would be:
Scan your body from top to toe for any sensations of discomfort or tension. Attempt to soften sensations of discomfort. Then, scan your body for any sensations of comfort and ease.
I usually do this at the beginning of a sit and during the sit if distracted by the body.
What tips work for you?