Leaning far out over the side with your feet locked under the hiking straps, countering the heel with your own weight. A quasi-isometric hold that lives mostly in the quads.
The sail flapping because the sheet is eased too far or you are pointing too high. That small bubble along the leading edge is not a fault — it is a trim marker.
Your heading relative to the wind: close-hauled, beam reach, broad reach, running. No boat sails closer than about 45 degrees to the wind — that sector is the no-go zone, and everything stalls in it.
When two boats meet on opposite tacks, the one with the wind on its port side keeps clear. The windward/leeward rule only kicks in once both are on the same tack.
The little wind threads on the sail — the most honest real-time trim feedback on board. When the windward and leeward thread both stream evenly aft, your trim is right.
The fine-tuning of sails and rig — mast rake, shroud tension, outhaul, cunningham, vang. Consistent trim wins more over a season than any spectacular single manoeuvre.
Windward is the side the wind comes from, leeward the sheltered side away from it. Your weight belongs to windward — where the wind comes from, not where the boat leans.
General
Terms from training theory that apply in every sport.
BMR is your basal metabolic rate at complete rest; TDEE is total daily expenditure including everyday movement and training. Nutrition targets always work off TDEE.