Question about Brimhaven Agility Arena.

So I checked the OSRS wiki and right now I am lvl 30 at agility. The wiki suggests I lvl at BAA and try to get tickets and jump over the spikes in the meantime.

The thing is that I basically have to walk all the way around in that arena because I keep failing agility checks except for spikes and falling rocks. It's annoying to keep failing the checks and have to walk all the way around and sometimes be too late because of that.

Is this normal or should I just do rooftops?