Methem said:
If you have no weights around, what can you do to maintain your strength? I haven't been able to lift weights for a week and I'm sure I've lost my strength.
First of all, I seriously doubt you lost any strength in the time period of a week. It's not very likely. In fact, if it has been a long time since you've taken a break from the gym then it probably a very good idea.
You can perform bodyweight exercises, plyometrics, and sprinting.
Bodyweight exercises for your lower body include:
Bulgarian squats, one legged squats on a perch, one legged free standing squats, sissy squats, etc.
For pressing movements with your upper body:
Pushups, hindu pushups, handstand pushups, T pushups, dips, bench dips, etc.
For pulling movements with your upper body:
Inverted rows, chinups, pullups, sternum chinups, etc.
Plyometrics include:
Jump squats, high or distance skipping, alternating leg bounds, distance jumps, depth jumps, clap pushups, etc.
You could also invest in some cheap tools like a couple medicine balls, sandbags, maybe a pair or two of some kettlebells, etc.
With the medicine balls you could do chest pass, slam the ball into the ground, reverse tosses, etc.
The sandbags have a lot of options. You could do farmer's walks, cleans, bear hugs, bag drags, reverse tosses, front squats, back squats, overhead pressing, rowing, curls, etc.
You could always do things like push cars in neutral around a parking lot, carry around buckets of water, perform bodyweight exercises with a loaded backpack, etc.
Get creative!