Then you should really add a heavy lifting day or two to your workout schedule, it will help you keep your muscle mass while in a caloric deficit. For weighted ab movements, try weighted decline crunches.
What’s wrong with your knees and hips? Priority number one should be rehabbing those body parts so you don’t have to eliminate so many really important exercises from your arsenal.
I’d remove curls and triceps pushdowns, because they’re pretty worthless when it comes to fat loss. Replace them with some cleans and chin-ups.
Crunches are a ridiculously limited core exercise. Try Russian twists, bridges, pallof presses or woodchoppers.
agreed…and scrap the lat pulldowns for pullups, even if you can’t do many, just crank them out lat pulldowns are virtually worthless in my eyes unless you’re either rehabbing or unusually weak.