How do I loop over a string's words in POSIX sh (or bash) in linux

Question

I have been trying to find a solution to how to loop over words in a string but I am unable to find anything so I decided to ask here :)

Basically, so far I tried looping over these ways:

• One (not POSIX)

while read -r line; do
   for token in "${line[@]}"; do
        echo "* $token"
   done
done

• Two

while read -r line; do
   for token in $line}; do
        echo "* $token"
   done
done

• Three

while read -r line; do
   for token in "${line}"; do
        echo "* $token"
   done
done

They all fail:

• #1 doesn't split
• #2 splits but also globs
• #3 doesn't split

And I can't find a solution, any idea how to do it?

I don't even care if it's POSIX at this point, thanks for the answers in advance