If you've been on a hiatus from training, or been too busy to make it a priority, you've gotta start somewhere & sometime right? Instead of waiting for the perfect time & place, consider starting with a mental approach that disregards timing, location, or special circumstances...

Thinking about just doing what you can, with the space &/or gear that you have, where you are is simple because the emphasis is on action. This can mean squeezing a 15 min jog during a break at work, using the stairs at every opportunity, or a general circuit of pushups, sit-ups and squats in the morning or at night at home. Once you get over the hump of starting, you'll find that what you can do, what you have, and where you are will wind up being at the gym, with weights in hand, pushing yourself to your limits...because you started the process.