For people who aren't are so fortunate, I always recommend that they look into Kettlebell Simple & Sinister on Amazon from Pavel Tsatsouline (there's a new version, recently released, easy to read and very dense with information and incredible strength training insights).
Simple & Sinister is essentially a 20 minute, no nonsense, 100% legitimate strength training routine that can be done daily, even in combination with other training programs and workouts. Kettlebells take up essentially no space and if you buy a reputable brand you will have this strength training implement for the rest of your life.