Here's a list of abs-boosting workouts that can be performed in the gym. This variety should help you engage all areas of your core for a balanced and effective workout.

1. **Planks**: This is a great exercise that works your entire core. You can increase difficulty by adding in plank variations like side planks, moving planks, or planks with leg lifts.

2. **Crunches**: Traditional crunches, reverse crunches, and bicycle crunches are all good options to target different areas of your abs. 

3. **Hanging leg raises**: This exercise is best performed with a pull-up bar. The movement targets your lower abs, but engaging your entire core will improve your stability during the exercise.

4. **Cable crunches**: This workout makes use of the cable machine to add some resistance to your crunches, increasing their intensity.

5. **Ab wheel rollouts**: An ab wheel is a useful piece of equipment for a challenging core workout. It engages all the muscles in your core, including your obliques.

6. **Russian twists**: This exercise can be performed with or without a weight. It engages your obliques and helps improve rotational strength.

7. **Mountain climbers**: Although usually classified as a full-body exercise, mountain climbers require a strong core to stabilize the body.

8. **Stability ball exercises**: There are numerous exercises that can be done with a stability ball, such as ball planks, ball crunches, or pikes, all of which work the abs.

9. **Medicine ball slam**: This full-body exercise can engage your core and improve power, especially if you add a twist to engage your obliques.

10. **Decline bench sit-ups**: Adding an incline or decline to your sit-ups can make them more challenging. Just make sure you maintain proper form to avoid straining your back.

11. **Barbell rollouts**: Similar to the ab wheel, but using a barbell instead. This can be more challenging due to the extra weight.

12. **Kettlebell windmills**: This is a great exercise for improving your core stability and strengthening your obliques.

Remember to engage your core during all of these exercises, and to maintain proper form to avoid injury. Also, don't forget that a strong core isn't just about having a six-pack: these muscles help stabilize your body during all sorts of movements, so keeping them strong is important for overall fitness.
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