How does this chair let the user control reclining resistance and movement?

It has tilt lock and tilt tension controls that adjust the rate and ease of reclining to better accommodate different sized users.

What comfort features does the HON ComforTask task chair include to help reduce back strain during long sitting periods?

It includes strong lumbar support to minimize back pain and oversized cushions for additional comfort.

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HON ComforTask Center-Tilt Task Chair - Supports Up to 300 lb - 17" to 22" Seat Height - Black Seat/Back - Black Base - H5902.S.CU10.T

Strong lumbar support to minimize back pain.
Oversized cushions for additional comfort.
Tilt lock and tilt tension controls the rate and ease with which chair reclines to accommodate different sized users.