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Look for the optimal area that's usually located right under the posterior aspect of the foot's arch. This location is home to the notorious plantar fascia, which gets much of the attention for local pain in this area. But keep in mind the neurological response that you're after. Look deeper anatomically and try to stimulate the neuromuscular junction of the medial and lateral plantar nerves, which will most likely cause the positive response you're needing. This area will be hypersensitive, so shoot for a 6/10 relative pain level when self-treating. (On a scale of 1 to 10, with 10 being the highest amount of pressure, go with about a level 6.) Once you've applied proper pressure over the ball, don't roll the ball up and down the plantar surface. Instead, keep the ball stationary, then extend and fully flex your toes. This is a slow and controlled active remedy that'll place tension and a bit of internal motion on the medial and lateral plantar nerves. This drill has shown promise for alleviating pain and opening up functional ranges of motion. Spend the time to position the ball perfectly with optimal pressure and take 30-60 seconds flexing and extending all five toes under control. – Dr. John Rusin