I found excellent Gnome program called workrave. I use this software everyday. From the desc file:
Update Ports Tree
Install workrave
Customize workrave
Add workrave to gnome panel > right click on panel > Add to panel type 'workrave' in search box and click on add. Once added right click on workrave > preferences to setup options and you are done. See one of exercise screen from by freebsd central box
With this software I was able to get rid of RSI problem.
Workrave is a program that assists in the recovery and prevention of
Repetitive Strain Injury (RSI). The program frequently alerts you to
take micro-pauses, rest breaks and restricts you to your daily limit.
These can be customized and it stops the counter when you stop.
The program can be run distributed on one or more PCs. All connected
PCs share the same timing information. When you switch computers, you
will still be asked to pause on time.
Update Ports Tree
Code:
portsnap fetch update
portaudit -F
portmaster -a
Install workrave
Code:
cd /usr/ports/x11/workrave
make install clean
Customize workrave
Add workrave to gnome panel > right click on panel > Add to panel type 'workrave' in search box and click on add. Once added right click on workrave > preferences to setup options and you are done. See one of exercise screen from by freebsd central box

With this software I was able to get rid of RSI problem.