Besides xargs, as Ljm Dullaart was mentioning, you can use:
find /some/dir -type f -exec chmod -x {} +
As a debug trick, you can see the generated command with:
find /some/dir -type f -exec echo chmod -x {} +
From the man page of find(1) command:
-exec command {} +
This variant of the -exec action runs the
specified command on the selected files, but the command line is built
by appending each selected file name at the end; the total number of
invocations of the command will be much less than the number of
matched files. The command line is built in much the same way that
xargs builds its command lines. Only one instance of {} is allowed
within the command, and it must appear at the end, immediately before
the +; it needs to be escaped (with a \) or quoted to protect it
from interpretation by the shell. The command is executed in the
starting directory. If any invocation with the + form returns a
non-zero value as exit status, then find returns a non-zero exit
status. If find encounters an error, this can sometimes cause an
immediate exit, so some pending commands may not be run at all. For
this reason -exec my-command ... {} + -quit may not result in
my-command actually being run. This variant of -exec always returns
true.
