Take R1 train to badalona (€2.40 15-20 minutes from plaça catalunya) and run coastline back to city. Flat 15km route along beaches with numerous water fountains along the route.

Start at pont del petroli follow passeig marítim south through montgat ocata finish barceloneta. Perfectly paved with kilometer markers throughout. Best timing 7-9am before mediterranean heat builds.

Bring metro card for return trip or swim at barceloneta and metro back. Zero elevation gain makes this accessible for most fitness levels.