Kim and Kourt get fit! Star shape up secrets

Kim and Kourtney wanted to bask in the summer sun in Miami recently but instead of just laying on the beach, they put on rollerblades and hit the town! Being active his helped Kim increase her self esteem. "I used to be shy and insecure walking around in a bikini," Kim opens up. "But now I just love feeling confident." Her body and attitude are ready for summer!