Hi,
for the first 5 weeks of my fatloss, my gym was closed and the only equipment i had access to was a 10kg dumbell and a 20kg skullcrush bar.
I used various forms of pushups to work my chest, here's a sample of a chest/delt/tri/traps + abs workout, probably from around week 3:
Normal Pushups
Military shoulder press (using the skullcrush bar)
Pushups (hands close together)
Shoulder shrug (with skullcrush bar)
Abdominal Crunches
Pushups (hands wide)
Lateral dumbell raises
Pushups (with elbows very close to the torso)
Shoulder shrug (with skullcrush bar)
Tricep Skullcrushers (with skullcrush bar, durr!, lol)
Abdominal raises (kindof like leg raises adapted to act almost like a reverse crunch)
I would repeat this routine three times with an extra three sets of normal pushups to really finnish me off at the end, lol.
Because i didnt have access to any heavy weights, I was relying on a the principle of light weights/lots of reps/lots of sets.
I would ensure that I kept a moderate to high pace all the way through as my muscles dont need as long to rest between light sets as they would between 180lb bench press sets, lol.
I didnt get this routine from anywhere so i cant offer any proof as to its success or the way in which it works.
All i know is that my chest, my delts and my tri's were pretty darm sore the day after, lol.
I also used variant of this style of workout for my Back/Bi workout and for my Leg workouts. ah what the hell, may aswell make use of all my workout logs, lol. Here's a back/bi + abs workout from about week 4 (fyi, i only work abs twice per week):
Standing Dumbell bicep curl (22lb)
Straight leg dead lift (using the 20kg,44lb skullcrush bar)
Bent over barbell row (skullcrush bar again)
Adbominals (alternating crunches and modified leg raises)
Barbell Bicep curl (using the skull bar in place of a barbell, very similar to hammer curls)
This would be repeated for 6/7 sets of each exercise. As before, I would keep a moderate pace. Again, my back and especially my forearms would feel it the next day, lol.
Legs:
Squats (using the skull bar)
Standing calf raises (one leg at a time, holding the skull bar to increase the weight)
Lunges (holding the 22lb dumbell)
Abdominals (just crunches in this example, but would usually alternate between crunches and modified leg raises)
I would only do 4/5 sets of these exercises becuase at the time my legs were having a hard time adapting to my cardio.
My word, this is a long post, lol.
Hope you can extract some useful information from all of this, lol.
Greeno
P.s. If you dont know what a skullcrush bar is, then here's a piccie:
Edit: Hey Jimbo, dont know if this is any use to you but at present, I can do approximately 35 normal pushups from full strength. In the gym, my working benchpress weight is approx 155lb. Maybe this can help you to approximate your starting bench weights. In terms of the muscles worked, i'm no expert, but i'd say they are pretty similar although a bench press will stimulate far more 'supporting' muscles, i.e. the muscles used to stop the bar pivotting forwards and breaking your legs, lol.