To obtaining the best results exercise sessions of aerobics

To obtaining the best results exercise sessions of aerobics is involving another warming up period, followed by at least 20 minutes of moderate to intense exercise involving large muscle groups, and a cooling down period at the end.
1)Obtain the best results, an aerobic exercise session involves a warming up
2)To obtain the best resulted, in aerobic session which involved a warming up exercise
3)Best of results are obtained, an aerobic session involving a warming up
4)Resulting in best way obtained as aerobic session involving a warmed up exercise
5)Obtaining the best of results, an aerobic session involves a warming up
OA

The Siberian Cranes have flown here from Siberia, although they are under going suspicion of have been carrying bird flu, but there is no serious evidence that they might bring it with them.
1)They were considered under suspicion of carrying
2)So they are under suspicion of carrying
3)They were thought of being under suspicion by carrying
4)Therefore they are under suspicion of carrying
5)They have been considered under suspicion
OA

Guys! Explanation???? (don't just post the answer, plzz! try to give explanation)