Can I train without a gym?
Yes. Answer "at home" and your program is built from what you have — body weight, a resistance band, dumbbells, a chair. No movement that needs a gym will appear. Running, walking and yoga are planned as fully as any gym program.
Updated
What changes when you add equipment
Update your equipment at any time. Add a pair of dumbbells and the program uses them from the next week.
With no equipment, load goes up through reps, pauses and leverage instead of weight.
How much space do I need
A mat's worth is enough. There is a no-jumping variant for anyone training in a flat with neighbours below.