When tapering, the objective is to lessen distance but maintain intensity. You seem to have done the first but increased intensity and now may be paying for it.
Some people respond well to massage. Others find stretching works to loosen up the hips and thighs, but sometimes things don't work out.
If your problems don't subside by race day, consider postponing your marathon. You may not get your moneysworth out of the one for which you have registered, but if you're not healthy at the start, the odds are high that you will be hurt more by the end.
If there is some very good reason that you need to keep to the plan with this marathon, go out easy and test yourself. If the first half feels comfortable, smile and enjoy the rest of it.
Of course, in the best of possible outcomes, a week's rest combined with stretching and massage will eliminate the problem. At this stage, don't worry about not running until race day. If you have less than ten days to go, there will be no material loss of fitness and recovery is important.
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