 [ Symptoms ] heart question urgent answer needed please i am 20 yrs old i have anxiety today i had a scary episode i was playing soccer i stopped when running and took a deep breath with this breath i felt a little fluttery feeling in my chest i continued running and it went away i have done ekg before no other symptoms with this flutter except i started to get very anxious since i have a paranoia about heart related problems i also have read about sudden cardiac arrest so naturally i was very scared any reassurance is welcome thx [ Disease ] many aerobic exercises are also weight bearing    the kind where you stand on your feet and exercise weight bearing aerobic exercises include walking aerobics dancing tennis climbing stairs and running weight bearing exercise stimulates the cells that make new bone and boost bone strength this is especially important for teenagers because your bone mass peaks between the ages of 25 and 30 adolescence is the time to build the strongest bones possible