Leg raise is a strength training

Strength training

Strength training is the use of resistance to muscular contraction to build the strength, anaerobic endurance, and size of skeletal muscles. There are many different methods of strength training, the most common being the use of gravity or elastic/hydraulic forces to oppose muscle contraction...

 exercise used for strengthening the abdominal muscles and hips

HIPS

HIPS may refer to:* High impact polystyrene* Home Information Pack* Host-based intrusion-prevention system, a computer security system oriented towards workstations...

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Leg raises without equipment are done by lying on the floor on the back. Keep the lower back

Human back

The human back is the large posterior area of the human body, rising from the top of the buttocks to the back of the neck and the shoulders. It is the surface opposite to the chest, its height being defined by the vertebral column and its breadth being supported by the ribcage and shoulders...

 in contact with the floor and place hands to sides or under lower back for support. Lift leg

Human leg

The human leg is the entire lower extremity or limb of the human body, including the foot, thigh and even the hip or gluteal region; however, the precise definition in human anatomy refers only to the section of the lower limb extending from the knee to the ankle.Legs are used for standing,...

s upward as far as possible. Lower down to starting position slowly and with control. Make sure back stays flat on floor and abdominals are tight. The exercise is easier if legs are bent, harder if legs are straight.

Leg raises can also be performed hanging onto an overhead bar. These are known as hanging leg raises and are more challenging than lying leg raises.