The description in the book describes touching the right hand in front of the left foot while the right leg goes up, then says to repeat it with the left hand going down, and that you've completed one rep when you've done that. Then, it says to switch legs. So, when doing ladders (1 rep, then 2 reps, then 3 reps, etc), is one to do the right leg twice as one rep, then do left twice, right twice as the second two reps, and so on? Or is "one rep" supposed to be twice on the right and twice on the left?

I would consult his website, but [the forum](https://www.marklauren.com/forum/) seems to perpetually be down.
['https://fitness.stackexchange.com/questions/28699', 'https://fitness.stackexchange.com', 'https://fitness.stackexchange.com/users/8039/']
Get a pullup/chinup bar. You can get one for about $20.

Buy a couple of parallel bars where you can do dips. If you have a couple of sturdy chairs, they will do.

Pullups, chinups, dips, pushups, planks, bodyweight squats are all great exercises that could make up for a very decent routine.
Lifting>family

but really, you might be able to find a place to do chinups in a park or on a tree or something, it's one of the best exercises to do. Maybe you can buy a metal bar from a hardware store and make a chinup station yourself. Dips are also great. Other than that you can start a running routine.