I've been thinking about this for awhile, it's hard to accept that you can get into shape and get a great workout using just your body weight. Especially now with all the gadgets on infomercials claiming you can get in the best shape with this product or that product. I remember when I was in grade school or junior high, I didn't know what weight lifting was, all I knew was push ups, sit ups, pull ups, stretching, and jogging and I still remember breathing hard after all of that.
I travel quite often for work, sometimes 1-2 days or sometimes weeks when it's overseas, yes I do try to find a gym when I'm gone for more than a week. But it's not worth it to me to find a gym to workout at when I'm going to be gone for 2 or 3 days. You don't have to be traveling to consider working out using just your own weight. You can use this routine just because you want to take a break from lifting weights in the gym. When I teach my Boot Camp Class, that's all we use, I have my girls do walking lunges to balance, plyometrics, core training, wind sprints, push up and so forth. You can do so many things without weights, all it takes is some imagination and research of course. So I'm going to list some exercises to get you started and you can incorporate them to fit your needs.
Walking lunges, sumo squats, regular squats, squats with hip abductions, side lunges, cross over lunges, scissor jumps, squat jumps, bear crawls, mountain climbers, squat into calf raise, walking lunges while staying low, walk-jog-run up a hill, walk-jog-run up stairs, power skips, planks, sit ups, crunches, v-ups, side planks, side crunches, bicycles, push ups, close push ups, plyometric push ups (clapping), glute lifts, reverse table tops (on your hands and feet looking at the sky and lift your hips up), moving table tops (moving around while your in a table top position), single leg squats, stand up without using your hands (lay on the floor/ground and stand up w/o using your hands to assist you), supermans (lay on your stomach and lift up your arms and legs and hold or move up and down), burpees, wind sprints, backward skips, jogging backwards, if your at a park- climb a pole, pull ups, lateral pull ups, try changing the pace of the exercises from fast to slow and controlled and vice versa, so there are some for you to try out. Choose 5-10 exercises and perform them for 15 seconds to start out and increase as you get accustomed to the routine. This will take you about 30-45 min. depending on your fitness level. Remember Train To Succeed and always choose the Correct Training Regimen. Good luck in your health endeavors.