David Mine demonstrates a new way I found (quite accidentally, actually) to roll out the hamstrings. First with legs down, then with legs elevated on a bench. I think the pics alone speak as to which one is a bit more “effective”. As you may well know, the foam-rollers aren’t all that effective for the hamstrings. Hence why so many of our athletes us the bowling ball for hamstring work. Not every box has a bowling ball though, so this method can be a very effective alternative.