Simple examples..
Back: pullups. Too easy? Use one arm.
Chest: pushups. Too easy? Vary your arms position, or just use one arm.
Legs: squats. Too easy? Use one leg.
Abs: sit ups. Too easy? Hold something heavy against your chest. Too easy? Hold something heavier.
It's not rocket science :) Motivation is the only ingredient you need for all the exercise you can tolerate.
They're a little low and only support <250lbs, but otherwise they are perfectly fine for the average home workout.
You can also do inverted rows under a table by holding on to an edge (not comfortable, but works).
You could invest into a dumbbell and/or resistance bands and do row variations. Or a TRX for inverted rows.
Or go to a park or anywhere else where you can hang onto to do your pullups.
Fault! This is adding weight. Better luck next time. :)
