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Results are presented from an ongoing study of the $\rho$ resonance. Thefocus is on CLS 2-flavour ensembles generated using $\mathcal{O}(a)$ improvedWilson fermions with pion masses ranging from $265$ to $437$ $\mathrm{MeV}$.The energy levels are extracted by solving the GEVP of correlator matrices,created with the distillation approach involving $\rho$ and $\pi\pi$interpolators. The study is done in the centre-of-mass frame and several movingframes. One aim of this work is to extract the timelike pion form factor afterapplying the L\"uscher formalism. We therefore plan to integrate this studywith the existing Mainz programme for the calculation of the hadronic vacuumpolarization contribution to the muon $g-2$.

Towards extracting the timelike pion form factor on CLS two-flavour ensembles