Soft field technique requires extra back pressure but also discipline. Don't over-rotate during the take-off roll.
Background
During an instruction flight, while performing a soft field take-off, the tail of the aircraft hit the runway. Because the procedure for a soft field take-off requires more back pressure on the yoke, you have to be extra careful not to over-rotate during the take-off roll.
Key points
Soft field technique = more back pressure than normal, but not unlimited
Over-rotation during the take-off roll causes tailstrikes
Practice the technique with an instructor before applying it solo
Tailstrike damage can be invisible — always inspect and report
Required actions
During soft field take-off, apply back pressure progressively, not abruptly
Watch the pitch attitude during the roll — not just the speed tape
If you suspect a tailstrike, abort if still on ground, or report and inspect after landing
Practice soft field with an instructor before relying on it solo
Further reading
Questions about soft field technique? Email