Another excellent exercise to learn rudder and airspeed control is the "Vertical S." The basic effort is to maintain the same speed in a climb and then in a descent to predetermined altitudes. As an example, level at 2,500 feet, you use climb power to climb to 3,000 feet at 70 knots. As you reach 3,000 feet you reduce power and lower the nose to maintain the 70-knot airspeed. As you descend to 2,500 feet you raise the nose and add climb power to again climb at 70 knots. As you get more comfortable, you can chop a hundred feet off each altitude. (Start at 2,000 feet, climb to 3,000 feet, descend to 2,100 feet, climb to 2,900 feet, etc.) Eventually, you can add turns in the climb and descent. If you use your normal approach speed as the target speed, the descent will ingrain the horizon picture that will let you maintain your approach path without having to rely on the airspeed indicator.