Final answer:
The Deadlift requires the greatest contribution from trunk stabilizers when using 80% 1RM.
Step-by-step explanation:
The exercise that requires the greatest contribution from trunk stabilizers when using 80% 1RM is the Deadlift. This exercise targets multiple muscle groups including the erector spinae, transverse abdominis, and obliques, which help stabilize the trunk during the movement.
Trunk stabilizers are particularly activated during the deadlift due to the need to maintain a neutral spine position and prevent any excessive rounding or arching. The weightlifting technique involved in the deadlift requires a strong stable core, making it a highly effective exercise for strengthening the trunk muscles.
On the other hand, exercises like the leg press, bicep curls, and leg extension place less emphasis on trunk stabilizers since they primarily target the lower body or upper body muscles and do not require as much core stability.