is also a weapon, helping to prevent falls which every year send more than two million seniors to the emergency room. according to the centers for disease control, only 35 percent of americans over 65 are considered physically fit. the aches and pains take their toll says 81-year-old julianne gooselaw. >> i fell and broke my pelle industries and a knee replacement a year ago. >> reporter: but with regular visits to the gym. >> now i can almost go a mile on the treadmill where i couldn't do that a year ago but i can now. i am stronger now than then. >> just imagine, we are blocking someone's punch here. >> reporter: stronger. >> it makes me feel young and gives me more energy. >> reporter: and safer says 74- year-old kim bogue, with cane fu. >> you are protecting yourself. if not, what happens? you let them get to you. no way. >> reporter: it is a boon for them. >> i can fight back. >> reporter: not so much for those trying to mess with them. >> let's go. ankle, ankle. >> there we go.