You can choose either loaded exercises or bodyweight exercises.
Since you are aiming to perform 100 reps in 10 minutes, you will need to regress the exercise to about 30-40% of what you can normally do for 1 rep. If you don’t know what you can normally do, just err on the side of ‘really easy’ or ‘really light’ if you are using weights for the first set. It will get harder as you get close to 100.
Loaded exercises require a load such as a dumbbell, kettlebell, barbell or the like. For shoulders, you could choose Dumbbell Overhead Press. For lower body you could choose a Kettlebell Deadlift. If you are into barbell lifts, you could do a Barbell Bench Press.
Bodyweight exercises such as a Leg Raise, is a good option for core work. For the upper body you could choose a Push Up. For lower body you could do ATG Squats. Elevating the heels helps correct most people’s form. If you are not confident of your form, send me a video and I’ll check it for you.