how to improve sliding

5:50

7:03

4:34

11:24

4:47

3:17

7:57

10:17

6:24

10:26

6:24

5:40

5:37

8:24

17:01

13:30

12:37

1:42:32

4:34

22:50

12:56

2:13

17:01

13:06

14:53

14:05

11:28

11:55

6:27

13:23

3:05

8:30

13:30

1:13:48

3:25

11:28

4:16

10:28

6:45

7:16