At least for soccer players, it comes down to a blend of two types of fitness - your base endurance, which comes from longer distance running, and your speed, which comes from sprint-based workouts. ↗
If I'm on holiday, I'm active on the beach, I play tennis, I run, I swim a lot. It's just about making the workouts fun, I think, and then it doesn't really feel that bad. ↗
I have worked out with the Thunder, Lakers, Knicks, Grizzlies, Spurs, and a few others before the draft. I have worked out primarily against shorter and supposedly faster players in these workouts. ↗
I think the key to working out is for people to think of water - just allow the workouts to fill out the cracks in your lives and seep into wherever you can fit it in. ↗