In a grind the trucks — the metal axles — slide along the edge; in a slide it is the underside of the deck. The 50-50, both trucks on the ledge, is the entry point.
The explosive snap of the tail that triggers every jumping trick. The board only leaves the ground once the front foot slides forward in the same instant. Measured thrust: roughly 2.2 times body weight.
The board balances on one of its long edges while you stand with your feet on the wheels and the deck edge. Toeside is the easier version — most people learn it first.
Small metal studs fitted to ledges, benches and handrails that kill any grind on contact. They are the owner's unmistakable no — which means: find another spot.
A block of wax rubbed along a ledge or rail makes the edge slippery. Without it, trucks and deck catch abruptly — the most common cause of falls when grinding.
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.