There is another option to sitting or standing at work – Focal calls it the 'Third Posture'. Focal's products allow you to work upright in a natural, neutral posture.

Mogo Kickstand Travel Seat
Mogo is a lightweight, portable seat, ideal for outdoor or indoor use. At just over two pounds, it is fully collapsible to fit into your tote bag or strap to your backpack.
Mobis I Leaning Seat * DEMO SALE *
Mobis, the adjustable height, lean-into seat and perfect partner for any standing desk.
Locus Leaning Seat with Anti-Fatigue Mat *DEMO SALE*
Locus Seat doesn't have you sit or stand. It helps you discover the perfect in-between position.
Confluence-6 Conference Table
Confluence table, make meetings matter again.
Mobis II Leaning Seat
Mobis II pefectly pairs with any standing desk or height-adjustable work station.  It's design promotes a healthy posture for the spine while encouraging movement.