Final answer:
Plyometrics is the modality that allows for explosively fast movements without eccentric deceleration.
Step-by-step explanation:
The modality that allows for movements to occur as explosively as possible without the need for eccentric deceleration is plyometrics. Plyometrics involves rapid and powerful movements, such as jumping or throwing, that utilize the stretch-shortening cycle of muscles.
This cycle involves a rapid eccentric contraction followed by an immediate concentric contraction, allowing muscles to generate maximum force. By focusing on explosive movements, plyometrics can enhance power and performance in sports and physical activities.