I would advocate trying any good single leg movement with dumbells over leg press for when your back is aggravated. The leg press tends to round out the lower back. Plus there is not a very good carry over to the squat. In general open chain movements like leg press don't have as good a carry over to close chain ones like squat which is one reason among many why something like step-ups are a better choice. Or any thing that you are comfortable with be it a split squat or lunge of some kind.
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