 | Fitness 7165 Fitness / Sports Medicine For a long time, I have had lumps on the bottom of one foot in the arch area, toward the inner half of my foot. They are the size of marbles. I don’t think they are getting larger. But now I get pain in that area when walking or if I stand for a long time. What’s going on? Are these tumors that need to be cut out? For a long time, I have had lumps on the bottom of one foot in the arch area, toward the inner half of my foot. They are the size of marbles. I don’t think they are getting larger. But now I get pain in that area when walking or if I stand for a long time. What’s going on? Are these tumors that need to be cut out? htmASKTHEDOCplantarfibromatosislumps Based on your description, this sounds like a condition called plantar fibromatosis (Ledderhose’s disease). Here, the plantar fascia (a layer of firm fibers under the skin in the bottom of the foot) forms hard, irregular lumps. 1445046 InteliHealth 2012-06-21 t Howard LeWine, M.D. 2015-06-21  | Ask The Expert | |  |  |  |  | | Archive By Date: Fitness / Sports Medicine | Page 1 of 3 | | Answered questions from the past 2 years: | |  When I walk for about a mile, my leg muscles suddenly get very weak — so weak I can hardly walk. After 10–15 minutes of rest, the muscles go back to normal and I can continue for another mile or so. I am trying magnesium pills. Is there anything else you suggest? |  My wife wants me to get more exercise. I play golf three or four times a week when weather permits. I think that’s enough. Who is right? |  What exercises can you do to help you keep your balance when you walk? |  When you’ve have a cold or the flu, how do you know when it's safe to continue a routine exercise program? |  What exercises are considered 'low impact?' Are there different guidelines for low impact exercises for teens than for adults? |  For the past few days I have woken up with a dull aching pain in my heel. The majority of the pain is on the bottom of the heel. I have not done anything out of the ordinary, and can think of no reason for this. What could be causing this pain? |  My husband is getting severe back spasms in his lower back, possibly as a result of twisting wrong while doing sit-ups. He is getting no relief from ibuprofen. Is there an over-the-counter alternative? |  Does exercise help you keep your memory? |  My doctor told me that adding an exercise regimen that kept my heart rate accelerated 30-40 minutes almost every day would be good for me. Doing that (and changing eating habits) helped me lose weight. My question is: is 60 minutes of cardio-exercise “twice as good” as 30 minutes? Is 45 minutes 50% better for me than 30? Or is there a diminishing return on incremental increases like that? |  Is exercise a good treatment for depression? | | | | |