bash ctrl-z to send a for loop in background, only the currently run command is resumed when bg

poc: $ for i in $( seq 1 10 ); do echo "begin $i"; sleep 4 ; echo " end $i" ; done begin 1 end 1 begin 2 end 2 begin 3 ## after 1 second, I : ctrl-z ^Z + Stopped sleep 4 $ fg # wait or no wait : same result sleep 4 $ # the loop wasn't continued. I notice: when pressing ctrl-z : only the currently running command (sleep) is shown as being sent in the background? What happens to the surrounding loop? and how could I have the whole for loop suspended and continued? with set -o settings? or do I need to create a script and have it sent to background? or just surround it with { } or ( ) ?