यस्त्विन्द्रियाणि मनसा नियम्यारभतेऽर्जुन ।
कर्मेन्द्रियै: कर्मयोगमसक्त: स विशिष्यते ॥ ३.७ ॥

yas-tv-indriyāṇi manasā niyamyārabhate’rjuna |
karmendriyaiḥ karma-yogam-asaktaḥ sa viśiṣyate || 3.7 ||

So, activity cannot be shunned, but involvement in activity poses its problems. Then, wherein lies the redress ? Krishna says :

Restraining the jnaanendriyas with the discriminating mind, one who performs all the activities with his karmendriyas, nevertheless remaining unattached, begins the karmayoga.

So the solution lies in beginning karmayoga. Let the body, mind and senses remain actively involved in objective pursuits. But while doing so, the discriminating mind should restrain the senses so that they are not overwhelmed by the objects. The mind guided by spiritual introspection will do the magic of Karmayoga. Everyday of performance will result in more and more mental purity and intelligential sublimity. Such purity and sublimity conduce to  real spiritual progress. Action never interferes with this process; rather, it helps.