STRAIGHT FOR THE GOLD. BIG KNOT ON THE TRACK FOR TEAM USA. THE 400 METER FINAL ALL BEGINNING 8:00 ON WRAL. >>> CARY CHIROPRACTOR DR. DAVID PASCAL IS WATCHING TRACK AND FIELD EVENTS CLOSELY. HE IS PREPARING FOR THE GAMES IN TOKYO. THANK YOU FOR JOINING US LIVE. I WOULD LIKE TO GET YOUR THOUGHTS ON TRACK AND FIELD EVENTS SO FAR, BUT BRACES ARE YOU WATCHING AND HOW DO YOU THINK COVID HAS IMPACTED PERFORMANCE IS? >> THANK YOU FOR HAVING ME. OF COURSE, MOST OF MY ATHLETES ARE SPRINTERS. I PAY SPECIAL ATTENTION TO THE MEN'S AND WOMEN'S 100, 200, 400 METER DASHES AND THE RELAYS. WE KIND OF HAVE MIXED RESULTS DURING THESE OLYMPIC GAMES. I'M NOT SURE COVID HAS HAD A DIRECT RESPONSE IN TERMS OF SO MANY ATHLETES COMING DOWN WITH COVID BUT THE BIGGEST THING IS IN TOKYO, THEY ARE QUARANTINING THE ENTIRE CITY. ALL OF THE ATHLETES. WHILE THEY ARE ALLOWED TO GO OUT OF THEIR DORM ROOMS AND WALK AROUND THE OLYMPIC VILLAGE, ONE OF THE KEY THINGS THE ATHLETES REALLY ENJOYED AND THE TREATING STAFF LIKE ME REALLY ENJOYED WHEN WE GO TO OLYMPIC CITY IS TO BE ABLE TO TRAVEL AROUND AND GET THE FLAVOR OF THAT CITY. UNFORTUNATELY, BECAUSE OF COVID AND THIS LOCKDOWN, THE ATHLETES ARE NOT AND THE STAFF ARE NOT ABLE TO GET OUT OF THE VILLAGE AND LOOK AROUND. >> THAT IS BEEN TOUGH AND TEMPERATURES ARE TOUGH IN THE 90s. TALK ABOUT THE HEALTH OF THE ATHLETES RUNNING IN THE HEAT. >> I'VE BEEN IN TOUCH WITH A LOT OF U.S. MEDICAL STAFF OVER THERE, WE HAVE BEEN LONGTIME FRIENDS. I WANT TO KEEP ABREAST ON EVERYONE. ALTHOUGH IT IS VERY HOT, THE ATHLETES ARE VETERANS, MEDICAL STAFF ARE TOP-NOTCH AND WE ARE BEING VERY PROACTIVE ON MAKING SURE THE ATHLETES ARE WELL HYDRATED, SOME OF THE ATHLETES ARE WEARING VESTS FILLED WITH ICE PACKS BEFORE THEY COMPETE. EVEN THOUGH TEMPERATURES HAVE BEEN QUITE LITERALLY DANGEROUSLY HOT, THERE HAS BEEN NOT A SINGLE U.S. ATHLETE WITH THE HEATSTROKE ISSUE. THEY ARE DOING A GREAT JOB WITH THAT. >> A LOT HAS BEEN MADE ABOUT THE SERVICE THEY ARE RUNNING ON, IT IS LIKE A TRAMPLING AND HELP TO CREATE RECORD-BREAKING TIMES . WHAT ABOUT THE SURFACE AND WHAT DOES IT DO FOR THE RUNNERS' KNEES AND LEGS AND BACK? >> THAT IS A GREAT QUESTION. YOU THINK IT IS A TRAMPLING BECAUSE IT IS A VERY FAST TRACK. THE DIFFERENCE BETWEEN A TRACK LIKE THIS AND REGULAR HIGH SCHOOL OR COLLEGE TRACK IS THAT THE REGULAR TRACKS ARE MORE LIKE A TRAMPLING. THEY ARE SOFTER AND THICKER LIKE A MATTRESS BECAUSE IT HELPS REDUCE INJURIES. BUT THAT SOFTNESS ACTUALLY ABSORBS THE ENERGY THE ATHLETES ARE PUTTING INTO THE TRACK WHEN THEIR FEET HIT. THAT TRACK IN TOKYO AND SOME OF THE OTHER FOR OLYMPIC STADIUM FOR WORLD CHAMPIONSHIP, WHAT THEY DO IS TRY TO MAKE A TRACK WITH AS LITTLE BOUNCE AS POSSIBLE FOR ALL THE FORCE THE ATHLETE PUTS INTO THE TRACK, THEY ARE ABLE TO PULL THROUGH AND COME OFF OF THAT TRACK QUICKER. IF YOU TRAINED ON A TRACK LIKE THAT, YOU WOULD PROBABLY GET INJURED. BUT TO COME TO OLYMPIC STADIUM AND RUN THREE OR FOUR RACES, YOU WILL RUN FASTER BECAUSE OF THE TRACK BUT INJURIES AREN'T REALLY THAT LIKELY. >> THAT IS GREAT TO HEAR. DR. PASCAL, I INTERVIEWED YOU IN RIO IN 2016 GAMES, I WISH WE