IF YOU'RE SKINNY AND ONLY GAINING 5 LBS PER YEAR. YOU'RE DOING IT WRONG. ALOT OF PEOPLE GAIN 30-40 EVEN 50 LBS IN THEIR FIRST YEAR OF WEIGHTLIFTING. OBVIOUSLY YOU CAN'T KEEP UP THAT UP FOREVER THOUGH OR EVERYONE WOULD WEIGH 300 LBS AFTER A FEW YEARS.
RDL'S ARE LIKE A STRAIGHT LEG DEADLIFT EXCEPT YOU KEEP THE BARBELL AGAINST YOUR LEGS AND PUSH YOUR HIPS BACK AS FAR AS YOU CAN AND ON THE REVERSE YOU EXTEND YOUR HIPS FORWARD AND FLEX YOUR HAMS AND GLUTES.