If you're looking for alternatives to the Captain's Chair Straight Leg Raise, there are several effective exercises that target similar muscle groups while offering different movement patterns and equipment requirements. Here are a few options:

• Hanging Straight Leg Raises: This exercise is performed by hanging from a pull-up bar and lifting your legs straight up towards your chest. It emphasizes the same lower abdominal muscles and hip flexors as the Captain's Chair exercise but requires upper body strength to maintain your grip. You can learn more about it here.

• Seated Leg Raises: This exercise involves sitting on the edge of a sturdy chair or bench and lifting one leg at a time. It is particularly beneficial for those who may have difficulty with more demanding exercises, as it allows for a controlled movement while still engaging the hip flexors and core.

• Lying Leg Raise and Hold: This exercise is performed lying flat on your back, lifting your legs towards the ceiling, and holding them at the top. It targets the lower abs effectively and can be a great addition to your routine if you're looking for a floor-based alternative.

These alternatives not only provide variety in your workout but also help in targeting the same muscle groups with different techniques. Try them out and see which one works best for you!