Use the sides of the dry dock to launch yourself into the air and reach the high coronas. For the NRG challenge, collect all the easy coronas at ground level first so you have plenty of time available to reach the harder to reach ones in the air. Both of these locations are shown in the below map: The NRG challenge is by far easier than the BMX challenge as it doesnt require a high bike skill to. In comparison the BMX challenge will require a high bicycle skill so you can perform high bunny hops to reach certain coronas, though the bike skill will come in handy for the Beat the Cock trophy. The NRG challenge is by far easier than the BMX challenge as it doesn't require a high bike skill to complete.
Both of these locations are shown in the below map: The BMX challenge is located at Glen Park in Los Santos, and the NRG challenge is located at the dry dock in the Easter Basin, San Fierro. Each time that you collect a corona you will receive an additional 15 seconds to your total time limit. The BMX and the NRG challenges are side missions which involve you having to ride either a bicycle or a motorbike through a series of checkpoints (coronas) within the given time limit.
