1.) offline reorg, you can do an export import (this is an old method but still used for very big tables)
2.) online reorg , you can use brtools to do this
brspace -u / -c force -p initSID.sap -s 20 -l E -f tbreorg -o sapsr3 -e 2 -t "RFBLG"
keep in mind this is done during low peak period as it causes a lock on the table
3.) the shrink methos i only use when i get no results from reorg
foot note: remember to update the statistics of the table when you are done.