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We have been there, our workouts are going really well but then life gets in the way... Sometimes it's a business trip, or perhaps a family vacation, maybe you're in the middle of a relocation?
I have a few suggestions for you that should be able to help you make it through this time with little to no loss in your gains ;)
Take a Break:
That's right, why not take a break, a break can be really good for you, let your body reset and allow some of those nagging injuries to heal up. You may even come back the next week with more energy and strength. The key here is to plan for it, so makes sure to get all your workouts in before and after, maybe even go a bit harder on either end of the break A week or two is not going to kill you if you have been putting the work in up to that point.
Have a De-load Week:
A de-load week is a when you train as close to normal as you can but at a much easier pace then usual. Similar to taking a rest week, your body will benefit from a de-load week by being able to heal and repair itself, again allowing you to come back stronger and healthier. Remember, you are going to be away from your usual training location and not be able to use your accustomed to fitness equipment. Taking it easy and not putting too much pressure on yourself to hit specific workout goals will make the away training session that much easier and stress free since you won't be so caught up on having to use all the equipment you are used to using.
Use the Hotel Gym:
Keep in mind, not all hotel gyms are the same, some hotels have really great gyms with everything you need to give your entire body a decent overall workout. But then some hotel gyms are just plain and simple lacking in many areas. In most cases you will be able to do a bit of research and find out if the gym in your hotel is adequate enough for the job, if not you could find a different hotel with a good gym or perhaps find a Gym in the area that you could drop in to.
Find a Near by Gym, Pool or Recreation Center:
Let's say your hotel or the place you are staying at does not have a gym, or the gym they have sucks! Most likely there will be something in your area that you could do a few drop-ins to and get your pump on :) Just a little bit of research beforehand or even when you get there should bring up some local Gyms, Pools, or Recreation Centers that have cheap enough drop-in fees. I have been to many Pools and Rec Centers with really good gyms in them so no need to make do with shoddy equipment if you don't have to.
Good Old Body Weight Exercises:
If the place you are staying at doesn't have a decent gym and there is no way you can get to a nearby fitness club, you can always perform some good old body weight movements like push-ups, sit-ups, lunges, air squats and even pull-ups if you can find something to hang from near by like a tree branch or kids playground. All activates better than doing nothing at all and I guarantee you will get your heart rate up, burn a few calories and feel a lot better after for doing it.
Now you know what to do in the event that you find yourself away from your local workout space. In most cases there are alternatives that will get you though till you are back home. Worst case you miss a week, that's OK too if you plan for the downtime, your body may thank you for it!