I have not done waterbury method myself although swanso recommends it highly.
"The important thing is to use compound movements.
1 – Horizontal Upper Body Pulling (Row variations)
2 – Horizontal Upper Body Pushing (Bench Press and Push Up variations)
3 – Vertical Upper Body Pulling (Pull Up, Chin Up and Pulldown variations)
4 – Vertical Upper Body Pushing (Shoulder Press variations)
5 – Hip Dominant Lower Body (Deadlifts, High Step Up and Long Stride Lunge variations)
6 – Quad Dominant Lower Body (Squat, Low Step Up and Short Stride Lunge variations)" (copied from earlier post by swanso)
you can add in arm exercises like curls or tricep presses
you could add in some calf raises
you could add in some core work like plank and bridge, I reccommend you stay away from weighted side bends as they will thicken your midsection
if you did the six above plus bicep barbell curl, tricep kickbacks, calf raises, toes on 2 - 25 lb plates,(please note that these groups are worked with the above excercises and are to be added only if you feel you want to add them) and plank 30 sec hold 30 sec rest (x3) and bridge for 20 -30 reps x3 with 1 minute rest you would be having a very well rounded and intense workout at 3 sets of 10 reps, 3 days a week. Your core is also worked during the 6 excercises above and only add these if you feel you want the extra core work, although they are not necessarily needed some people like working their core a little more direct during their workouts.
On your off days you could do 1/2 hour sprints or intervals. For example, current intervals are every 2 mins I do a 30 sec. sprint. So on 2, 4, 6, etc. minutes on the elyptical I go over 90% for 30sec on level 15 then the next 1 1/2 minutes go easy at level 6 or 7 at about 50% with no arm action. I do a five minute walk on the treadmill before and after to limber up and get the blood flowing or cool down and stretch after the workout, so total time is about 50 minutes or so. eventual goal is get to 1 min hard 2 min easy than do a 1:1 min ratio.
Cheers tia-ga