Final answer:
The exercise that matches the description of a 2-second hold and a 3-second eccentric phase is the standard chin-up.
Step-by-step explanation:
The exercise that involves a 2-second hold and a 3-second eccentric phase is likely the chin-up. During a chin-up, an individual can incorporate a 2-second hold at the top of the movement when the chin is above the bar, followed by a controlled 3-second eccentric phase where they lower their body back to the starting position.
Neither the TRX row, X-pulldown, nor the weighted chin-up specifically requires a hold and eccentric phase of these exact time frames; thus, the best match for the described exercise is the standard chin-up.