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When a machine is taken, missing, or not working for you, the question is which alternative covers the same muscles. Each guide answers that, and says what the alternative does not cover, and what equipment it takes.
The leg extension isolates the quads like nothing else does. Here is what comes closest, what each alternative leaves out, and what equipment it takes.
The leg press lets you load the legs heavily with your back supported. Here is what replaces it, and what each swap asks of you instead.
The deadlift trains the whole posterior chain in one lift. Here is what covers which part of it when a barbell is not the answer.
The pulldown is how most people train the lats. Here is what replaces it, from bodyweight to bands, and what each one leaves out.
The bench press is the default chest lift. Here is what replaces it when there is no bar, no bench, or no spotter, and what each swap changes.
Every guide ends with a straight answer to “if you only pick one”, and stops where technique coaching begins.
Also free: the calculators, which show every step of their arithmetic, and the blog.
In the Fitener app every exercise in your plan can be swapped for one that covers the same muscles with the equipment you have.