I've gone through phases where I'd work up to two sets of 50 an evening. Chest about 4 inches from ground. Try touching your chest lightly to the floor. At my best, I could only do maybe 20 or 30 of those.

I'm sure it's way better than nothing. Once you get good at those, try hands-stand pushups, with your body almost vertical, up against a wall.

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1986 300SDL, 362K
1984 300D, 138K