Planet Fitness Inc. PLNT announced Thursday that its first-quarter revenue and profit were lower than expected. However, the company provided a growth forecast for the full year, saying “all generations are back to their pre-pandemic levels of population penetration.” The net income increased from $16.5m, or 19c per share, to $22.7m, or 27c per share. Earnings per share adjusted to exclude nonrecurring items was 41 cents, which missed the FactSet consensus estimate of 46 cents. The revenue grew by 19.0%, to $222.23 millions. However, it was lower than the FactSet consensus…