Both units will probably last you a lifetime and will enable you to do (almost) all of the resistance work you will ever need, including dips, chin ups, push ups and
abdominal knee raises.
Not exact matches
One study has shown that doing the vertical chair
knee raise, can stimulate your
abdominal muscles by around 200 % more than a standard crunch.
Alternatively you can build a ton of strength in your lower
abdominals in preparation for the straight leg lift by bending your
knees and
raising them up and down to either side.
AB Workout — a few different exercises for
abdominal muscles: Vertical
Knee Raises and Sit Ups.
The frog kick or plank
knee raises is a way to increase the muscle work in your
abdominal muscles when you're doing the plank.
The Vertical
Knee Raise — one of the most effective exercises for rectus
abdominal and one of the most popular in the ABS workout.
These are following ones: plank, side planks with rotation, plank
knee tucks, pike, straight leg
abdominal twists and leg
raises.
Abdominals Workout # 1 Hanging Leg
Raises Bicycle Crunches V - Ups
Knee - Ins Twisting Crunches (preferably on Swiss ball) Crunches (preferably on Swiss ball)