Biden taking precautions to avoid falls as age becomes campaign issue

President Biden is working with a physical therapist and wearing tennis shoes to improve balance and prevent falls.
White House officials have disputed reporting about fall prevention efforts, comparing it to past superficial media controversies.
Biden has stumbled on stairs and made verbal gaffes, raising concerns about his age and fitness among some voters.
Polls indicate many believe Biden may be too old to serve effectively, and some Democrats prefer a different 2024 nominee.
Biden nearly fell exiting Air Force One in September 2023, hours after reports on efforts by his team to minimize such incidents.