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/']
[Gymnastic Strength Training](https://www.gymnasticbodies.com/) is a perfect option for you in my opinion. It is very well designed program with tons of progressions and requires almost negligible equipment.
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.